Hydrogen storage bottle with plastic inner container for aircraft

Abstract

The plastic inner container hydrogen storage bottle comprises a bottle neck, an inner container and a fiber layer wound outside the inner container, the inner container comprises a front sealing head section, a cylinder body section and a rear sealing head section which are sequentially connected, the front sealing head section is in arc transition connection with the bottle neck and the cylinder body section, the cylinder body section is cylindrical, and the rear sealing head section is in arc transition connection with the cylinder neck. The front end socket section seals the bottom of the cylinder body section and protrudes outwards to form a curved surface, the rear end socket section seals the bottom of the cylinder body section and protrudes outwards to form a curved surface, the fiber layer comprises a spiral winding layer used for covering the front end socket section and the rear end socket section and an annular winding layer used for covering the cylinder body section, and the fiber layer further comprises a reinforcing layer which comprises a main body part covering the front end socket section and / or the rear end socket section. And the extension part covers part of the cylinder body section. The main body part can reduce the number of required spiral winding layers and reduce the weight of the hydrogen storage bottle while improving the strength of the front and rear end socket sections; the extension part can ensure that the reinforcing layer is reliably fixed at a set position, and stress is prevented from being concentrated and transferred to the joint of the front end socket section and / or the rear end socket section and the cylinder body section.

Description

Technical Field

[0001] This utility model relates to a hydrogen storage bottle, and more particularly to a hydrogen storage bottle with a plastic inner liner for aircraft. Background Technology

[0002] Hydrogen energy, as a secondary energy source, is characterized by its cleanliness, high efficiency, and abundant resources, and has broad research and application prospects. The hydrogen energy industry chain mainly includes three aspects: hydrogen production, storage, transportation, and application. Among these, storage and transportation are crucial to the development of hydrogen energy, and hydrogen storage cylinders are important tools for hydrogen storage and transportation. Currently, commercially produced hydrogen storage cylinders can be divided into four types, among which Type III (aluminum-lined carbon fiber fully wound cylinder) and Type IV (plastic-lined carbon fiber fully wound cylinder) have the greatest long-term development potential. Type IV cylinders offer superior performance in terms of lightweight design, hydrogen storage density, and volume specifications.

[0003] CN214535657U discloses a high-pressure hydrogen storage cylinder with a plastic inner liner composite material. This multi-layered structure improves the impermeability of the inner liner, but also significantly increases the cylinder's weight. For conventional hydrogen storage cylinders, to improve production efficiency, the fiber layers often have redundant windings. Furthermore, stress concentration easily occurs at the connection between the fiber layers and the cylinder neck, as well as at the end cap shoulder. In vehicle-mounted hydrogen storage cylinders, to reduce processing steps, special reinforcement structures are typically not designed; instead, additional spiral layers are directly wound to increase the cylinder's strength. All of these factors contribute to the increased weight of the hydrogen storage cylinder.

[0004] The aforementioned weight increase is negligible for automobiles, but when Type IV bottles are applied to aircraft, this weight will directly affect the aircraft's payload, flight speed, and range. Utility Model Content

[0005] Purpose of the utility model: The purpose of this utility model is to provide a hydrogen storage cylinder with a plastic inner liner for aircraft that can both ensure strength and reduce the weight of the hydrogen storage cylinder.

[0006] Technical Solution: The hydrogen storage cylinder with a plastic inner liner for aircraft according to this utility model includes a nozzle, an inner liner, and a fiber layer wound around the outer side of the inner liner. The inner liner includes a front end section, a cylindrical section, and a rear end section connected in sequence. The front end section connects the nozzle and the cylindrical section in an arc transition. The cylindrical section is cylindrical. The rear end section closes the bottom of the cylindrical section and protrudes outward to form a curved surface. The fiber layer includes a spiral winding layer for covering the front end section and the rear end section and a circumferential winding layer for covering the cylindrical section. The fiber layer also includes a reinforcing layer, which includes a main body covering the front end section and / or the rear end section and an extension covering part of the cylindrical section.

[0007] Because stress concentration easily occurs in the front and rear end cap sections, these sections are weak points in the strength of the hydrogen storage cylinder. Generally, to meet the axial load requirements, multiple layers of helical winding are needed. The above solution, by covering the front and rear end cap sections with a reinforcing layer, can improve the strength of these sections while reducing the number of helical winding layers required, thereby reducing the weight of the hydrogen storage cylinder and improving the vehicle's range and speed. Furthermore, the extension of the reinforcing layer not only ensures that the reinforcing layer is reliably fixed in the designated position but also prevents stress concentration from being transferred to the connection between the front and / or rear end cap sections and the cylinder body. It should be noted that the helical winding layer covering the front and rear end cap sections does not mean that the helical winding layer only covers the front and rear end cap sections. Its fiber winding path can be from the front end cap section to the rear end cap section and back to the front end cap section, repeating this cycle until a helical winding layer covering the front end cap section, cylinder body section, and rear end cap section is formed.

[0008] The spiral winding layer is configured as multiple layers, with at least one spiral winding layer disposed on the innermost side. The spiral winding layer can completely surround the inner liner of the hydrogen storage cylinder, giving the hydrogen storage cylinder a certain strength. During the winding process, the fiber yarn has a certain tension, so a certain amount of gas pressure is injected into the inner liner of the hydrogen storage cylinder during winding to prevent the inner liner from collapsing. The innermost spiral layer can prevent the gas pressure from expanding the front and rear end caps of the inner liner of the hydrogen storage cylinder.

[0009] At least one spiral winding layer is disposed on the outermost side. Preferably, the outermost spiral winding layer is disposed in two layers. Since the spiral winding layer can cover both the front and rear end cap sections as well as the cylinder body section, using the spiral winding layer for the outermost winding can effectively compress the circumferential winding layer and the reinforcing layer, ensuring the reinforcing effect of the fiber layer.

[0010] The circumferential winding layer is disposed on the outside of the extension and directly presses against the extension. By pressing the extension against the circumferential winding layer, the reinforcing layer can be reliably fixed.

[0011] The circumferential winding layer is configured as multiple layers. The use of multiple circumferential winding layers further enhances the strength of the cylinder section.

[0012] Along the axial direction of the cylinder section, the dimension of the extension is D, and the dimension of the cylinder section is E, where 1 / 40 ≤ D / E ≤ 1 / 30. By controlling the dimension of the extension within the above range, the weight of the extension is minimized while ensuring reliable fixation, thereby reducing the overall weight of the hydrogen storage cylinder.

[0013] The reinforcing layer is a resin-impregnated fiber cloth. The fiber cloth itself is not adhesive, but the resin impregnation allows the fibers to aggregate and generate tension, while also allowing the fibers to adhere more tightly to the inner liner of the hydrogen storage cylinder.

[0014] Beneficial effects: Compared with the prior art, the present invention has the following advantages: 1. By covering the front and rear end cap sections with a reinforcing layer, the strength of the front and rear end cap sections can be improved while reducing the number of spiral winding layers required, thereby reducing the weight of the hydrogen storage tank and improving the endurance and flight speed of the aircraft; 2. Furthermore, the extension of the reinforcing layer can not only ensure that the reinforcing layer is reliably fixed in the set position, but also avoid stress concentration being transferred to the connection between the front end cap section and / or the rear end cap section and the cylinder section. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a partially enlarged view of the front end cap section of this utility model;

[0017] Figure 3 This is a partial enlarged view of the cylindrical section of this utility model. Detailed Implementation

[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0019] Example 1: As Figures 1 to 3As shown, the hydrogen storage cylinder for aircraft with a plastic inner liner according to this utility model includes a nozzle 1, an inner liner 2, and a fiber layer 3 wound around the inner liner 2. The inner liner 2 includes a front end cap section 21, a cylindrical section 22, and a rear end cap section 23 connected in sequence. The front end cap section 21 connects the nozzle 1 and the cylindrical section 22 in an arc transition. The cylindrical section 22 is cylindrical. The rear end cap section 23 closes the bottom of the cylindrical section 22 and protrudes outward to form a curved surface. The fiber layer 3 includes a spiral winding layer 31, a circumferential winding layer 32, and a reinforcing layer 33. The spiral winding layer 31 covers the front end cap section 21, the cylindrical section 22, and the rear end cap section 23. The circumferential winding layer 32 covers the cylindrical section 22. The reinforcing layer 33 includes a main body portion 33a covering the front end cap section 21 and the rear end cap section 23, and an extension portion 33b covering part of the cylindrical section 22. The spiral winding layer 31 is configured as multiple layers, and at least one spiral winding layer 31 is disposed on the innermost side. In the front end cap section 21 and the rear end cap section 23, the fiber layer 3, from the inside out, includes a spiral wound layer 31, a main body 33a of the reinforcing layer 33, and two spiral wound layers 31. In the area of ​​the cylindrical section 22 not covered by the reinforcing layer 33, the fiber layer 3, from the inside out, includes a spiral wound layer 31, a circumferential wound layer 32, and two spiral wound layers 31. In the area of ​​the cylindrical section 22 covered by the reinforcing layer 33, the fiber layer 3, from the inside out, includes a spiral wound layer 31, an extension 33b, two circumferential wound layers 32, and two spiral wound layers 31. Along the axial direction of the cylindrical section 22, the dimension of the extension 33b is D, and the dimension of the cylindrical section 22 is E, D / E = 1 / 33, where D is 5 cm and E is 165 cm. The reinforcing layer 33 is a resin-impregnated fiber cloth.

[0020] Specifically, the fiber layer 3 can be applied to the hydrogen storage bottle following these steps:

[0021] Step 1: The inner liner 2, which is designed in advance and placed on the winding machine, is pre-wound according to the layup scheme through the spiral winding layer 31;

[0022] Step 2: Reinforce the front end cap section 21 and the rear end cap section 23 of the gas cylinder. Use a fully resin-impregnated and pre-cut fiber cloth as a reinforcing layer 33, and spread it evenly on the front end cap section 21 and the rear end cap section 23 so that the extension 33b is 5 cm in size, so that the circumferential winding layer 32 can press the extension 33b tightly.

[0023] Step 3: After laying the reinforcing layer 33, use two layers of circumferential winding layer 32 to fix the reinforcing layer 33 to the cylinder section 22, and use two layers of spiral winding layer 31 to press the reinforcing layer 33 tightly to the front end section 21 and the rear end section 23;

[0024] Step 4: Place in a curing oven for curing.

[0025] To further illustrate the effect of this embodiment, the following comparative example is set:

[0026] Comparative Example 1: Prepare inner liner 2, resin and curing agent, carbon fiber, and a winding machine. Fix inner liner 2 on the winding machine, pre-charge it with a certain pressure, mix the resin and curing agent in a 1:1 ratio, and pour the mixture into the glue tank to begin the actual winding process. During winding, the spiral winding layer 31 and the circumferential winding layer 32 are wound alternately. To meet strength requirements, the spiral winding layer 31 has two more layers than in Example 1. Finally, the hydrogen storage cylinder is sent to a curing oven for curing.

[0027] Comparative Example 2: The steps are the same as in Example 1, but without the reinforcement layer 33.

[0028] Weighing and hydrostatic burst tests were conducted on the hydrogen storage cylinders of Example 1 and the two comparative examples. The experimental results are shown in Table 1.

[0029] Table 1

[0030] sample weight / kg Burst pressure / MPa Comparative Example 1 3.18 80.18 Example 1 2.88 79.90 Comparative Example 2 2.75 63.50

[0031] The test results show that the burst pressure of Example 1 is almost the same as that of Comparative Example 1, but the weight is significantly reduced. Compared with Comparative Example 2, which simply reduces the number of spiral winding layers (31 layers), the burst pressure is significantly improved. Therefore, this invention can reduce the weight of the hydrogen storage cylinder while ensuring its strength, thus reducing its adverse effects on the performance of the aircraft when used in spacecraft.

[0032] Example 2: The difference between this example and Example 1 is that the number of circumferential winding layers 32 is 1, the size D of the extension 33b is 6 cm, D / E = 1 / 30, and E is 180 cm.

[0033] Example 3: The difference between this example and Example 1 is that, on the basis of the two outer spiral winding layers 31, there are alternating circumferential winding layers 32 and spiral winding layers 31.

[0034] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A plastic liner hydrogen storage cylinder for aircraft, comprising a cylinder mouth (1), a liner (2) and a fiber layer (3) wound outside the liner (2), the liner (2) comprising a front head section (21), a barrel section (22) and a rear head section (23) connected in sequence, the front head section (21) being arc-shaped to connect the cylinder mouth (1) and the barrel section (22), the barrel section (22) being cylindrical, and the rear head section (23) closing the bottom of the barrel section (22) and outwardly protruding to form a curved surface, the fiber layer (3) comprising a spiral winding layer (31) for covering the front head section (21) and the rear head section (23), and a hoop winding layer (32) for covering the barrel section (22), characterized in that, The fiber layer (3) further comprises a reinforcing layer (33), the reinforcing layer (33) comprising a main body part (33a) covering the front head section (21) and / or the rear head section (23), and an extension part (33b) covering part of the barrel section (22).

2. The plastic liner (2) hydrogen storage cylinder for aircraft according to claim 1, characterized in that, The spiral winding layer (31) is arranged in multiple layers, and at least one layer of the spiral winding layer (31) is arranged at the innermost side.

3. The plastic liner (2) hydrogen storage cylinder for aircraft according to claim 2, characterized in that, At least one layer of the spiral winding layer (31) is arranged at the outermost side.

4. The plastic liner (2) hydrogen storage cylinder for aircraft according to claim 1, characterized in that, The hoop winding layer (32) is arranged outside the extension part (33b) and directly compresses the extension part (33b).

5. The plastic liner (2) hydrogen storage cylinder for aircraft according to claim 4, characterized in that, The hoop winding layer (32) is arranged in multiple layers.

6. The plastic liner (2) hydrogen storage cylinder for aircraft according to claim 1, characterized in that, In the axial direction of the barrel section (22), the size of the extension part (33b) is D, and the size of the barrel section (22) is E, 1 / 40≤D / E≤1 / 30.

7. The plastic liner (2) hydrogen storage cylinder for aircraft according to claim 1, characterized in that, The reinforcing layer (33) is a fiber cloth impregnated with resin.

Images