A hydrogen storage buoy assembly for a hydrogen energy seaplane and a manufacturing method thereof

Abstract

The invention relates to a hydrogen storage buoy assembly of a hydrogen energy seaplane and a manufacturing method thereof, belonging to the technical field of aircraft design, and solving the problem of low efficiency of hydrogen storage methods of hydrogen energy aircraft in the prior art. The assembly comprises: a hydrogen storage buoy with a ship-shaped structure, comprising a keel structure and a skin structure covering the keel structure; a hollow support rod fixed to the hydrogen storage buoy, the delivery pipe being connected to the interior of the hydrogen storage buoy, and being used for supporting the hydrogen storage buoy and delivering liquid hydrogen in the hydrogen storage buoy; wherein the skin structure has a multi-layer structure, and comprises an outer tank body, a heat insulation and shock absorbing layer and an inner tank body in sequence from the outside to the inside; the inner tank body is the innermost structure of the skin structure, and is made of an aluminum alloy material, so as to prevent hydrogen molecules of liquid hydrogen stored in the hydrogen storage buoy from penetrating into the skin material to cause hydrogen embrittlement; the heat insulation and shock absorbing layer is located outside the inner tank body; and the outer tank body is located on the outer surface of the heat insulation and shock absorbing layer.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft design, and more specifically to a hydrogen storage buoy assembly of a hydrogen energy seaplane and a manufacturing method thereof. Background Art

[0002] In recent years, with the emergence of the concept of green aviation, more and more new energy aircraft have been applied to the aviation field, and hydrogen-powered aircraft have been widely studied. Since hydrogen-powered aircraft usually store hydrogen by converting hydrogen into liquid and storing it in liquid hydrogen tanks, the liquid hydrogen tanks need to occupy a large space inside the aircraft, which greatly reduces the aircraft's carrying capacity and the efficiency of the aircraft's mission execution.

[0003] When hydrogen energy is applied to seaplanes, the carrying capacity of the seaplanes is also reduced due to the need to reserve a large space for liquid hydrogen tanks in the aircraft cabin.

[0004] The Chinese utility model patent, with the authorization announcement number CN211618085U and the utility model name "Seaplane", discloses a seaplane including a floating device. However, the floating device can only provide buoyancy for the seaplane when it floats on the water, and cannot provide liquid hydrogen storage and transportation functions.

[0005] The Chinese invention patent application, publication number CN109353499A, titled "A hydrofoil type seaplane", discloses a seaplane including left and right floats installed under the wings. However, the floats can only provide buoyancy when the aircraft floats on the water, and cannot provide liquid hydrogen storage and transportation functions.

[0006] The Chinese invention patent application, publication number CN109229372A, titled “A seaplane strut structure”, discloses a seaplane strut structure for connecting the float of the seaplane to the fuselage. However, the strut structure cannot provide liquid hydrogen transportation function.

[0007] Therefore, there is a need in the art for a device structure that can provide multifunctional, safe and reliable liquid hydrogen storage and water surface floating support for hydrogen-powered seaplanes. Summary of the invention

[0008] In order to solve the above problems, according to an embodiment of the present invention, a hydrogen storage buoy assembly and a manufacturing method for a hydrogen-powered seaplane are provided. Using the internal space of the buoy for hydrogen storage not only saves the internal space of the aircraft fuselage but also reduces the weight of the original hydrogen storage bottle, while taking into account the role of the buoy, thereby improving the carrying capacity of the hydrogen-powered seaplane.

[0009] A hydrogen storage buoy assembly of a hydrogen energy seaplane provided according to an embodiment of the present invention comprises:

[0010] A hydrogen storage buoy having a ship-shaped structure, in which liquid hydrogen is accommodated, comprising a keel structure and a skin structure covering the keel structure; and

[0011] A hollow support rod fixed to the hydrogen storage buoy, the hollow support rod being in communication with the interior of the hydrogen storage buoy and being used to support the hydrogen storage buoy and transport liquid hydrogen in the hydrogen storage buoy;

[0012] The skin structure has a multi-layer structure, and includes an outer tank body, a heat insulation and shock absorption layer, and an inner tank body from the outside to the inside;

[0013] The inner tank body is the innermost structure of the skin structure and is made of aluminum alloy material to prevent hydrogen molecules of liquid hydrogen stored in the hydrogen storage buoy from penetrating;

[0014] The heat-insulating and shock-absorbing layer is located on the outer surface of the inner tank body and includes a multi-layer closed-cell foam layer made of a closed-cell foam material;

[0015] The outer tank body is located on the outer surface of the heat insulation and shock absorption layer, and includes multiple layers of carbon fiber plies, and the carbon fiber plies are selected as follows: Alternating layers of steel are laid at different angles to ensure the impact resistance of the hydrogen storage buoy.

[0016] In an optional embodiment, the bottom of the hydrogen storage float has a transverse step in the middle, and the size of the rear part of the step after the step is smaller than the front part of the step before the step; the rear part of the step is provided with a tail lift angle by the hydrogen storage float in the rearward direction of the step, and the tail lift angle is the angle between the bottom surface of the rear part of the step and the horizontal plane; the front part of the step has bilges on both sides, and the bilges are convex ridges extending from the junction of the bottom of the front part of the step with the left and right sides respectively; the front part of the step has an oblique rise angle, and the oblique rise angle is the angle between the bottom surface of the front part of the step that is inclined upward from the longitudinal center line to the left and right sides and the horizontal plane.

[0017] In an optional embodiment, the keel structure includes a longitudinal keel beam and a transverse bulkhead thereon, the transverse bulkhead including a front bulkhead located in front of the step and a rear bulkhead located rearward of the step, wherein the front bulkhead and the rear bulkhead have different shapes and sizes to adapt to the shape of the hydrogen storage float.

[0018] In an optional embodiment, the transverse bulkhead includes 6 front bulkheads arranged in front of the step and 4 rear bulkheads arranged behind the step; and the front bulkhead has a convex ridge structure corresponding to the bilge at the front of the step.

[0019] In an optional embodiment, an airtight layer is provided between the multiple closed-cell foam layers of the heat-insulating and shock-absorbing layer.

[0020] In an optional embodiment, the hollow support rod is in the form of a hollow cylinder with a hydrogen pipeline installed inside. One end of the hollow support rod is fixed to the hydrogen storage buoy, and the hydrogen pipeline inside the hollow support rod is connected to the interior of the hydrogen storage buoy. The hydrogen pipeline and the hydrogen storage buoy are connected by a pressure reducing valve, and the pressure reducing valve includes an airtight device.

[0021] According to another embodiment of the present invention, a method for manufacturing a hydrogen storage buoy assembly of a hydrogen energy seaplane includes the following steps:

[0022] Step S1, manufacturing a keel structure, punching an aluminum alloy profile into an integral shape to form a longitudinal keel beam, punching an aluminum alloy profile into a transverse bulkhead, and welding and fixing the transverse bulkhead to the longitudinal keel beam in sequence;

[0023] Step S2, manufacturing the inner tank body, stamping the aluminum alloy profile into two symmetrical parts of the inner tank body, fixing the two parts into an integral inner tank body by welding, and performing surface treatment on the inside and outside of the inner tank body;

[0024] Step S3, manufacturing a heat insulation and shock absorbing layer, foaming the closed-cell foam material, and then plasticizing the foamed foam material, and performing curing and cooling treatments;

[0025] Step S4, assembling the keel structure, the inner tank body and the heat-insulating and shock-absorbing layer, fixing the inner tank body to the outer surface of the keel structure, and then covering and fixing the heat-insulating and shock-absorbing layer to the outer surface of the inner tank body;

[0026] Step S5, setting an outer tank body, laying the carbon fiber material evenly impregnated with epoxy resin on the surface of the thermal insulation and shock absorption layer according to the laying angle, and curing and surface treatment are performed to form a multi-layer carbon fiber laying layer surrounding the outer surface of the thermal insulation and shock absorption layer, thereby obtaining a hydrogen storage buoy;

[0027] Step S6, manufacturing a hollow support rod, using an alloy material to manufacture the hollow support rod, and passing the hydrogen transmission pipeline through and installing it into the hollow support rod;

[0028] Step S7, installing and fixing the hollow support rod to the hydrogen storage buoy, wherein the hydrogen delivery pipeline in the support rod is connected to the interior of the hydrogen storage buoy via the pressure reducing valve.

[0029] In an optional embodiment, the step S5 further includes providing a glass fiber ply on the outer surface of the multi-layer carbon fiber ply.

[0030] The hydrogen storage buoy assembly of the hydrogen energy seaplane provided according to the embodiment of the present invention has at least the following advantages over the prior art: while providing the buoyancy required for the seaplane to glide on the water surface, the internal space is used to store liquid hydrogen to provide the fuel required for the hydrogen energy seaplane to power the hydrogen energy seaplane, and it has versatility and convenience; the structure of the hydrogen storage buoy in the hydrogen storage buoy assembly of the hydrogen energy seaplane of the present invention can provide good sealing, heat preservation and buffering effects during the flight of the hydrogen energy seaplane and when it lands on the water surface, ensuring the storage safety of liquid hydrogen in the hydrogen storage buoy; the structure of the hollow support rod in the hydrogen storage buoy assembly of the hydrogen energy seaplane of the present invention simultaneously provides reliable support for the hydrogen storage buoy, as well as safe and efficient liquid hydrogen transportation from the hydrogen storage buoy to the power device of the hydrogen energy seaplane; compared with the design of the buoy in the prior art, the hydrogen storage buoy assembly of the hydrogen energy seaplane of the present invention broadens the function of the buoy, does not need to set up additional hydrogen storage equipment on the hydrogen energy seaplane, improves the space utilization efficiency and carrying capacity of the cabin of the seaplane; and promotes the wider application of hydrogen energy seaplanes. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. The features and advantages of the present invention can be more clearly understood by referring to the drawings. The drawings are schematic and should not be understood as limiting the present invention in any way. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A side view of a hydrogen storage buoy assembly of a hydrogen-powered seaplane provided according to an embodiment of the present invention.

[0033] Figure 2 It is a front view of a hydrogen storage buoy in a hydrogen storage buoy assembly of a hydrogen energy seaplane according to an embodiment of the present invention.

[0034] Figure 3 It is a three-dimensional schematic diagram of a hydrogen storage buoy in a hydrogen storage buoy assembly of a hydrogen energy seaplane provided according to an embodiment of the present invention.

[0035] Figure 4 A schematic diagram of a keel structure of a hydrogen storage buoy assembly of a hydrogen energy seaplane provided according to an embodiment of the present invention.

[0036] Figure 5 A schematic diagram of a front bulkhead of a keel structure of a hydrogen storage buoy assembly of a hydrogen-powered seaplane according to an embodiment of the present invention.

[0037] Figure 6A schematic diagram of a rear bulkhead of a keel structure of a hydrogen storage buoy assembly of a hydrogen-powered seaplane according to an embodiment of the present invention.

[0038] Figure 7 It is a cross-sectional view of a skin structure of a hydrogen storage buoy of a hydrogen storage buoy assembly of a hydrogen energy seaplane provided according to an embodiment of the present invention.

[0039] Figure 8 A partial cross-sectional view of a hollow support rod of a hydrogen storage buoy assembly of a hydrogen-powered seaplane according to an embodiment of the present invention.

[0040] Description of reference numerals:

[0041] 100-Hydrogen storage buoy

[0042] 1-Broken steps;

[0043] 2-bilge;

[0044] 10-keel structure;

[0045] 3-Front bulkhead;

[0046] 31- ridge structure;

[0047] 4-Rear bulkhead;

[0048] 5-Longitudinal keel beam;

[0049] 20-skin structure;

[0050] 22- outer tank body;

[0051] 24- heat insulation and shock absorption layer;

[0052] 26-Inner tank;

[0053] 200-Hollow support rod;

[0054] 210-Hydrogen pipeline. DETAILED DESCRIPTION

[0055] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0056] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0057] The embodiments of the present invention take into account that the internal space of the float needs to be filled with low-density materials, and the density of liquid hydrogen is 70.99g / L, which is only 7% of the density of water, and a float structure with a hydrogen storage function is designed. The difficulty of this technology lies in how to provide a safe and reliable hydrogen storage solution to ensure that liquid hydrogen will not leak due to external influences during the aircraft's mission. The influences here mainly include the evaporation and leakage of liquid hydrogen caused by external heat transfer and the structural failure caused by the impact load when the seaplane lands on the water. Therefore, the hydrogen storage float structure needs to be able to isolate the transfer of external heat and have sufficient strength to resist the impact load during the landing process on the water.

[0058] The embodiment of the present invention first designs the shape of the hydrogen storage buoy. The purpose of the shape design of the hydrogen storage buoy is to reduce the resistance of the seaplane gliding on the water surface and sailing in the air. First of all, the hydrogen storage buoy must ensure that the seaplane has sufficient buoyancy on the water surface, which requires the buoy design to have a larger volume to ensure sufficient displacement and reserve margin. Secondly, in order to reduce the resistance of the seaplane gliding on the water surface and sailing in the air, the shape of the hydrogen storage buoy is streamlined, the front streamline is smooth to reduce the air resistance of the seaplane during flight, and the rear streamline is inclined upward to improve the efficiency of the seaplane during the water take-off process, so the bottom has the form of a ship bottom. In addition, the seaplane glides on the water surface, which requires the hydrogen storage buoy to provide sufficient buoyancy, and the buoy needs to have a larger volume to ensure sufficient displacement and reserve margin. Based on the above conditions, the shape design of the hydrogen storage buoy mainly has the following characteristics: the hydrogen storage buoy has a larger surface area and cross-sectional area, and the bottom has hull characteristics to ensure efficiency when gliding on the water surface. In an exemplary embodiment, the dimensions of the hydrogen storage buoy are set to be 9.7 m in total length, 1.295 m in maximum width, and 6.388 m in volume. 3 , and the bottom of the pontoon is designed based on the hull to reduce water surface resistance.

[0059] refer to Figures 1 to 8 According to an embodiment of the present invention, a hydrogen storage buoy assembly of a hydrogen energy seaplane is provided, including: a hydrogen storage buoy 100 with a ship-shaped structure; a hollow support rod 200 fixed to the hydrogen storage buoy 100, for supporting the hydrogen storage buoy 100 and transporting liquid hydrogen in the hydrogen storage buoy 100.

[0060] like Figure 1 , Figure 2 and Figure 3As shown, the hydrogen storage buoy 100 is provided with a transverse step 1 at the longitudinal middle position of its bottom, and the size of the rear part of the step after the step 1 is inwardly contracted compared to the front part of the step before the step 1. Thus, the hydrogen storage buoy 100 is divided into the front part of the step and the rear part of the step. The front and rear cross-sections of the step 1 are different, and the cross-section of the front part of the step is slightly larger than the cross-section of the rear part of the step. The setting of the step 1 can reduce the influence of the water surface adsorption force when the seaplane takes off. The rear part of the step of the hydrogen storage buoy 100 is provided with a tail lift angle in the rear direction of the step 1. , the tail lift angle is the angle between the bottom surface of the rear portion of the step and the horizontal plane. In one embodiment, for example, the tail rise angle It can be set to 23°. The front part of the step has bilges 2 on both sides, which are ridges extending along the junction of the bottom of the front part of the step and the left and right sides. The bilge 2 is set at the front part of the step to prevent the splash caused by the hydrogen-powered seaplane when gliding on the water from affecting the operation of other systems of the aircraft. The front part of the step has a ramp angle The slope angle is the angle between the bottom surface of the front part of the step that slopes upward from the longitudinal midline to the left and right sides and the horizontal plane. In one example, the ramp angle The size can be set to 23°. The purpose is to reduce the impact load of the water surface on the hydrogen storage buoy 100 when the hydrogen energy seaplane lands on the water surface.

[0061] For example, in an exemplary embodiment, the size of the hydrogen storage buoy 100 is set to be 9.7 m in total length, 1.295 m in maximum width, the maximum width is located at step 1, and the total volume is 6.338 m 3 .

[0062] like Figure 4 , Figure 5 and Figure 6As shown, in this embodiment, the structural design of the hydrogen storage buoy 100 refers to the hull structure, and the internal support structure of the hydrogen storage buoy 100 is a keel structure 10, which is composed of a longitudinal keel beam 5 and a transverse bulkhead, wherein the bulkhead located in front of the step is the front bulkhead 3, and the bulkhead located in the rear of the step is the rear bulkhead 4. In order to match the contour of the hydrogen storage buoy 100, the shapes and sizes of the front bulkhead 3 and the rear bulkhead 4 are slightly different. For example, in order to adapt to the step 1 structure, the cross-sectional area of ​​the rear bulkhead 4 is slightly smaller than that of the front bulkhead, and the front bulkhead 3 has a convex ridge structure 31 corresponding to the bilge of the front of the step. In one example, the number of bulkheads arranged in the longitudinal direction of the keel structure 10 of the hydrogen storage buoy is 10, wherein 6 front bulkheads 3 are arranged in front of the step, and 4 rear bulkheads 4 are arranged behind the step. The material of the keel structure 10 can be made of aluminum alloy material to take into account both light weight and high structural strength. When the hydrogen storage buoy 100 bears the impact load during the landing of the hydrogen energy seaplane on the water surface, the keel structure 10 ensures that the structure of the hydrogen storage buoy 100 has strong impact strength and rigidity, and can withstand large impact loads without deformation or damage.

[0063] like Figure 7 As shown, the hydrogen storage buoy 100 includes an outer skin structure 20, which is coated on the outside of the keel structure 10. In order to realize the function of storing hydrogen in the hydrogen storage buoy 100, the skin structure 20 is composed of multiple layers of different materials, which may include an outer tank body 22, a heat insulation and shock absorbing layer 24 and an inner tank body 26 from the outside to the inside. The inner tank body 26 is the innermost structure of the skin structure 20, and aluminum alloy materials may be used to prevent the hydrogen molecules of the liquid hydrogen stored in the hydrogen storage buoy 100 from penetrating and causing hydrogen embrittlement. Aluminum alloy materials are extremely insensitive to hydrogen embrittlement and can provide good anti-hydrogen embrittlement effects. In one example, aluminum alloy is selected to manufacture the inner tank body 26, and the thickness of the inner tank body 26 is set to 7 mm to ensure the anti-hydrogen embrittlement effect while the thickness can provide appropriate strength.

[0064] The heat-insulating and shock-absorbing layer 24 is located outside the inner tank body 26, and includes a multi-layer closed-cell foam layer made of a closed-cell foam material, and the closed-cell foam layers are separated by an airtight layer. In one example, the heat-insulating and shock-absorbing layer 24 may include three layers of closed-cell foam layers, and the thickness of each closed-cell foam layer is 5 mm. Optionally, the airtight layer between the closed-cell foam layers can be made of stainless steel coated with an aluminum oxide film. For example, in one example, the aluminum oxide film can be set to 1 mm. The setting of the multi-layer closed-cell foam layer and the airtight layer can ensure the temperature inside the hydrogen storage buoy 100 to ensure the liquefied state of the stored liquid hydrogen, prevent hydrogen leakage, and provide excellent impact resistance and shock absorption performance. The heat-insulating and shock-absorbing layer 24 is bonded to the inner tank body 26 and the outer tank body 22 by using an industrial adhesive. The adhesive used may include epoxy resin, polyurethane and silicone adhesive.

[0065] The outer tank body 22 is located outside the thermal insulation and shock absorbing layer 24 and is the outermost layer of the skin structure 20 of the hydrogen storage buoy 100. The outer tank body 22 can be made of multiple layers of carbon fiber to ensure the impact resistance of the hydrogen storage buoy 100. When the hydrogen energy seaplane lands on the water, the impact load on the hydrogen storage buoy 100 is perpendicular to the outer surface of the hydrogen storage buoy 100 from below, that is, upward along the normal direction of the lower surface of the hydrogen storage buoy 100. The carbon fiber ply angle of the outer tank body 22 is selected to be The outer tank 22 is provided with alternating layers, so that when responding to an impact, the material can absorb and disperse energy from multiple directions, so as to effectively balance the strength of the material in different directions, provide excellent impact resistance, and avoid damage to the structure of the hydrogen storage buoy 100 caused by the impact. In one embodiment, the multi-layer carbon fiber ply of the outer tank body 22 can be selected from 300g (i.e., 0.167mm thick) carbon fiber cloth, and the laying thickness is 5mm. Optionally, the outer tank body 22 may also include a glass fiber ply outside the multi-layer carbon fiber ply. For example, the glass fiber ply can be set to a thickness of 0.1mm, and the laying angle is also selected The ply thickness can be set to 1.5 mm, and the total ply thickness of the outer tank body 22 is about 6.5 mm.

[0066] The multi-layer arrangement of the skin structure 20 has good air tightness and heat preservation properties, ensuring the sealing of the liquid hydrogen in the hydrogen storage buoy 100 and keeping it in a liquid state.

[0067] The installation of the hydrogen storage buoy 100 needs to consider the influence of the longitudinal position and transverse position of the buoy on the flight performance of the seaplane. The longitudinal position needs to refer to the center of gravity position of the aircraft. According to general experience, the center of gravity of the seaplane should be before the step 1 of the hydrogen storage buoy 100. The horizontal distance between the center of gravity of the aircraft and the step 1 can be expressed as:

[0068]

[0069] Wherein B is the maximum width of the hydrogen storage buoy 100 .

[0070] The determination of the lateral position of the hydrogen storage buoy 100 is mainly based on the position of the main landing gear of the seaplane. The hydrogen energy seaplane includes two hydrogen storage buoys 100 fixed to the aircraft landing gear in parallel, and the lateral spacing between the two main landing gears is the lateral spacing between the longitudinal center lines of the two hydrogen storage buoys 100. The installation angle of the hydrogen storage buoy 100 needs to satisfy the following formula:

[0071]

[0072] in, is the critical angle of attack of the wing, Mounting angle for the wing, It is the tail lift angle of the hydrogen storage buoy 100. The installation angle is the projection angle between the longitudinal axis of the aircraft and the longitudinal axis of the hydrogen storage buoy 100 on the symmetry plane of the aircraft.

[0073] refer to Figure 1 and Figure 8 In this embodiment, the hollow support rod 200 is installed at the front part above the hydrogen storage buoy 100 to provide auxiliary support. Figure 8 As shown, in this embodiment, the hollow support rod 200 is in the form of a hollow cylinder, and a hydrogen pipeline 210 is installed inside to meet the hydrogen delivery demand. One end of the hollow support rod 200 is fixed to the hydrogen storage float 100, and the hydrogen pipeline 210 in the hollow support rod 200 is connected to the inside of the hydrogen storage float 100. The hydrogen pipeline 210 and the hydrogen storage float 100 can be connected through a pressure reducing valve, and the pressure reducing valve includes an airtight device to prevent hydrogen leakage during the flight process, landing on the water surface, etc. of the hydrogen energy seaplane. The pressure reducing valve can be controlled to switch between an open state and a closed state, wherein in the open state, the inside of the hydrogen storage float 100 is connected to the hydrogen pipeline 210, and liquid hydrogen can be transported; in the closed state, the hydrogen storage float 100 and the hydrogen pipeline 210 are closed. When the hydrogen storage float assembly is installed on the hydrogen energy seaplane, the other end of the hollow support rod 200 is fixed to the fuselage, and the hydrogen pipeline 210 is connected to the power unit in the cabin. Therefore, the hollow support rod 200 can provide a supporting function while also realizing a liquid hydrogen transport function.

[0074] Optionally, the hollow support rod 200 can also be configured to coat the hollow inner wall with an aluminum alloy coating to directly serve as a hydrogen transmission channel, so that the hollow support rod 200 can be directly used to transport liquid hydrogen, and can isolate the penetration of hydrogen materials to prevent hydrogen embrittlement. One end of the hollow support rod 200 is fixed to the hydrogen storage buoy 100, and the hydrogen transmission channel in the hollow support rod 200 is connected to the interior of the hydrogen storage buoy 100. When installed on a hydrogen-powered seaplane, the other end of the hollow support rod 200 is fixed to the fuselage, and a connecting pipe is provided to connect the hollow support rod 200 to the power unit in the cabin for hydrogen transmission. This method can further simplify the structure of the hydrogen delivery component and reduce assembly parts.

[0075] When liquid hydrogen is being transported, the pressure pump inside the hydrogen energy seaplane provides suction force to draw the liquid hydrogen from the hydrogen storage buoy 100, and enter the power device inside the hydrogen energy seaplane through the hollow channel in the hollow support rod 200 to realize energy supply.

[0076] When the hydrogen-powered seaplane lands on the water surface, the impact load is borne by the main body of the hollow support rod 200 and the skin structure 20 of the hydrogen storage buoy 100 .

[0077] The manufacturing process of the hydrogen storage buoy assembly of the hydrogen energy seaplane provided in accordance with an embodiment of the present invention comprises the following steps:

[0078] Step S1, manufacturing the keel structure 10, using a punch press to punch a flat aluminum alloy profile into an integral shape to form a longitudinal keel beam 5, and punching a transverse bulkhead, so as to form a shape consistent with the keel structure 10. By forming the longitudinal keel beam 5 in an integral manner, the high strength and rigidity of the keel structure 10 are ensured. The transverse bulkhead is manufactured in the same manner, and the bulkhead is fixed to the keel by welding. Optionally, the welding method may be TIG (argon arc welding).

[0079] Step S2, manufacturing the inner tank body 26. First, the aluminum alloy profile is stamped according to the shape of the inner tank body 26, the plate is processed separately along the symmetry plane, and the stamped plate is welded together. Then, the inside and outside of the inner tank body 26 can be subjected to corresponding surface treatment. Optionally, the surface treatment can be polishing. After the production is completed, the finished product of the inner tank body 26 can be subjected to pressure test and leakage test, and the next process is carried out after the test passes.

[0080] Step S3, manufacturing the heat insulation and shock absorption layer 24 arranged on the outer surface of the inner tank body 26. The original closed-cell foam material is foamed by a foaming machine, and then the foamed foam raw material is shaped by a mold, and solidified and cooled. Each closed-cell foam layer of the heat insulation and shock absorption layer 24 can be divided into two parts by the symmetry plane for processing, and the two parts are connected by heat welding after the processing. The inner and outer sides of each closed-cell foam layer can be airtightly treated with 316L stainless steel sheets coated with 1mm aluminum oxide film.

[0081] Step S4 , assembling the keel structure 10 , the inner tank body 26 and the heat-insulating and shock-absorbing layer 24 , fixing the inner tank body 26 to the outer surface of the keel structure 10 , and then covering and fixing the heat-insulating and shock-absorbing layer 24 to the outer surface of the inner tank body 26 .

[0082] Step S5, setting the outer tank body 22. Manufacture the carbon fiber layer, cut the carbon fiber material into appropriate sizes, evenly cover the carbon fiber cloth with epoxy resin, and lay the carbon fiber cloth impregnated with epoxy resin on the outer surface of the thermal insulation and shock absorption layer 24 made of closed-cell foam according to the designed laying angle to form a multi-layer carbon fiber ply. A glass fiber layer can also be set on the outer surface of the multi-layer carbon fiber ply, including cutting the glass fiber, impregnating it with epoxy resin, and then laying it on the outer surface of the multi-layer carbon fiber ply. Curing is carried out under the conditions of specified temperature and pressure, and finally surface treatment is carried out to form the outer tank body 22 surrounded by the outer surface of the thermal insulation and shock absorption layer 24, thereby obtaining the hydrogen storage float 100.

[0083] Step S6 , manufacturing the hollow support rod 200 , using alloy material to manufacture the hollow support rod 200 , and passing the hydrogen transmission pipeline 210 through and installing it into the hollow support rod 200 .

[0084] Step S7 , the hollow support rod 200 is installed and fixed to the hydrogen storage buoy 100 , wherein the hydrogen delivery pipeline 210 is connected to the interior of the hydrogen storage buoy 100 via a pressure reducing valve.

[0085] The process of landing a hydrogen-powered seaplane equipped with a hydrogen storage buoy assembly provided by an embodiment of the present invention on the water surface is as follows. During the landing process, the hydrogen-powered seaplane approaches the water surface at a relatively small aircraft pitch angle, and the bottom surface of the hydrogen storage buoy after the step, that is, the rear part of the step, first contacts the water surface and forms a stable contact surface. After the bottom of the hydrogen storage buoy 100 contacts the water surface, the hydrogen-powered seaplane begins to glide on the water surface and begins to decelerate. At the same time, the pitch angle of the hydrogen-powered seaplane decreases and the area of ​​the hydrogen storage buoy 100 contacting the water surface increases, and the draft increases to provide sufficient lift. As the speed decreases, the buoyancy borne by the hydrogen storage buoy 100 exceeds the hydrogen-powered seaplane's own gravity, causing the hydrogen-powered seaplane to float. The structure and design of the above-mentioned hydrogen storage buoy 100 enable the hydrogen-powered seaplane to contact the water surface with a relatively small area when landing, breaking the water surface tension to reduce the impact load.

[0086] The process of transporting liquid hydrogen in a hydrogen energy seaplane equipped with a hydrogen storage buoy assembly provided by an embodiment of the present invention is as follows. The pressure reducing valve connecting the hydrogen storage buoy 100 and the hydrogen delivery pipeline 210 in the hollow support rod 200 is controlled to switch to an open state, and the liquid hydrogen in the hydrogen storage buoy 100 is sucked by a liquid hydrogen pump installed inside the fuselage of the seaplane, and transported into the fuselage through the hydrogen delivery pipeline 210 connected to the hydrogen storage buoy 100. After entering the fuselage, the liquid hydrogen is converted into gaseous hydrogen, and then transported into the fuel cell system to react with oxygen to provide electrical energy.

[0087] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A hydrogen storage buoy assembly for a hydrogen energy seaplane, characterized in that: include: A hydrogen storage buoy with a ship-shaped structure, containing liquid hydrogen, comprising a keel structure and a skin structure covering the keel structure; A hollow support rod fixed to the hydrogen storage buoy, the hollow support rod being in communication with the interior of the hydrogen storage buoy and being used to support the hydrogen storage buoy and transport liquid hydrogen in the hydrogen storage buoy; The skin structure has a multi-layer structure, and includes an outer tank body, a heat insulation and shock absorption layer, and an inner tank body from the outside to the inside; The inner tank body is the innermost structure of the skin structure and is made of aluminum alloy material to prevent hydrogen molecules of liquid hydrogen stored in the hydrogen storage buoy from penetrating; The heat-insulating and shock-absorbing layer is located on the outer surface of the inner tank body and includes a multi-layer closed-cell foam layer made of a closed-cell foam material; The outer tank body is located on the outer surface of the heat insulation and shock absorption layer, and includes multiple layers of carbon fiber plies, and the carbon fiber plies are selected as follows: Alternate layers of different angles to ensure the impact resistance of the hydrogen storage buoy; The bottom of the hydrogen storage buoy has a transverse step in the middle, and the size of the rear part of the step after the step is smaller than the front part of the step before the step. A tail lift angle is set on the hydrogen storage buoy at the rear of the step in the rearward direction of the step, and the tail lift angle is the angle between the bottom surface of the rear of the step and the horizontal plane; The front part of the step has bilges on both sides, and the bilges are convex ridges extending along the junctions of the bottom of the front part of the step with the left and right sides respectively; The front part of the step has an oblique rise angle, which is the angle between the bottom surface of the front part of the step that is inclined upward from the longitudinal midline to the left and right sides and the horizontal plane; The keel structure includes a longitudinal keel beam and a transverse bulkhead above the longitudinal keel beam, wherein the transverse bulkhead includes a front bulkhead located in front of the step and a rear bulkhead located in rear of the step. The front bulkhead and the rear bulkhead have different shapes and sizes to adapt to the shape of the hydrogen storage buoy.

2. The hydrogen storage buoy assembly of the hydrogen energy seaplane according to claim 1, characterized in that: The transverse bulkhead includes 6 front bulkheads arranged in front of the step and 4 rear bulkheads arranged behind the step; and the front bulkhead has a convex ridge structure corresponding to the bilge at the front of the step.

3. The hydrogen storage buoy assembly of the hydrogen energy seaplane according to claim 1, characterized in that: An airtight layer is arranged between the multiple closed-cell foam layers of the heat-insulating and shock-absorbing layer.

4. The hydrogen storage buoy assembly of the hydrogen energy seaplane according to claim 1, characterized in that: The hollow support rod is in the form of a hollow cylinder with a hydrogen pipeline installed inside. One end of the hollow support rod is fixed to the hydrogen storage buoy, and the hydrogen pipeline inside the hollow support rod is connected to the interior of the hydrogen storage buoy. The hydrogen pipeline and the hydrogen storage buoy are connected through a pressure reducing valve, which includes an airtight device.

5. A method for manufacturing a hydrogen storage buoy assembly of a hydrogen energy seaplane according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step S1, manufacturing a keel structure, punching an aluminum alloy profile into an integral shape to form a longitudinal keel beam, punching an aluminum alloy profile into a transverse bulkhead, and welding and fixing the transverse bulkhead to the longitudinal keel beam in sequence; Step S2, manufacturing the inner tank body, stamping the aluminum alloy profile into two symmetrical parts of the inner tank body, fixing the two parts into an integral inner tank body by welding, and performing surface treatment on the inside and outside of the inner tank body; Step S3, manufacturing a heat insulation and shock absorbing layer, foaming the closed-cell foam material, and then plasticizing the foamed foam material, and performing curing and cooling treatments; Step S4, assembling the keel structure, the inner tank body and the heat-insulating and shock-absorbing layer, fixing the inner tank body to the outer surface of the keel structure, and then covering and fixing the heat-insulating and shock-absorbing layer to the outer surface of the inner tank body; Step S5, setting an outer tank body, laying the carbon fiber material evenly impregnated with epoxy resin on the surface of the thermal insulation and shock absorption layer according to the laying angle, and curing and surface treatment are performed to form a multi-layer carbon fiber laying layer surrounding the outer surface of the thermal insulation and shock absorption layer, thereby obtaining a hydrogen storage buoy; Step S6, manufacturing a hollow support rod, using an alloy material to manufacture the hollow support rod, and passing the hydrogen transmission pipeline through and installing it into the hollow support rod; Step S7, installing and fixing the hollow support rod to the hydrogen storage buoy, wherein the hydrogen delivery pipeline in the support rod is connected to the interior of the hydrogen storage buoy via the pressure reducing valve.

6. The manufacturing method according to claim 5, characterized in that: The step S5 further includes providing a glass fiber ply on the outer surface of the multi-layer carbon fiber ply.

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