Composite material oil tank

Abstract

The utility model discloses a composite material oil tank in the technical field, which comprises an outer skin, an inner skin and rib boxes, the outer skin and the inner skin are in butt joint to form a hollow groove frame, a plurality of groups of rib boxes are arranged in an array, the rib boxes are arranged in the hollow groove frame, and the outer skin and the rib boxes are connected in a co-glue joint mode. No nail hole is formed in the surface of the outer skin, the leakage risk of the oil tank is reduced, and the inner skin is detachably installed at the citron strip of the rib box. The reinforcing frame comprises a front end frame and a rear end frame, and the front end frame and the rear end frame are arranged at the two ends of the empty groove frame respectively. The oil tank is provided with the two concave areas, so that the design and the manufacturing of the oil tank with the special-shaped section and the concave parts are realized, the light weight of the oil tank is realized through the low density of the composite material, and the oil tank can be well sealed.

Description

Technical Field

[0001] This utility model relates to the field of fuel tank technology, and in particular to a composite material fuel tank. Background Technology

[0002] Currently, there are two types of fuel tanks on airplanes. One type is made of aluminum alloy, which has the characteristics of high strength and resistance to both high and low temperatures. However, it requires high precision in welding processes. In addition, the density of aluminum alloy is 2700 kg / m³. 3 Therefore, aluminum alloy fuel tanks are relatively heavy, which is not conducive to weight reduction. Another type is the composite material fuel tank, which has a density of 1600 kg / m³. 3 Furthermore, the strength and stiffness of composite materials are similar to those of aluminum alloys. Under the same conditions, the weight of a composite material fuel tank is lower than that of an aluminum alloy fuel tank.

[0003] However, existing technologies have some problems: Currently, common composite material fuel tanks use rivets, bolts, and support nuts to connect the inner and outer skins, rib boxes, and front and rear sealing plates together. Due to the internal pressure inside the fuel tank and external aerodynamic loads, the number of rivets and bolts used for fuel tank connections is generally large. With the increase in the number of connections, there is a risk of leakage if the connection holes of each rivet and bolt are not properly sealed. In addition, previous composite material fuel tanks were usually of uniform cross-section, which is easy to demold, and the production of fuel tanks with unequal cross-sections has always been a difficult problem to solve. Therefore, we propose a composite material fuel tank. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a composite material fuel tank that can be designed and manufactured with an irregular cross-section and a recess, and can also be well sealed.

[0005] The purpose of this utility model is achieved as follows: a composite material fuel tank, comprising:

[0006] The outer skin, inner skin, and rib box are provided. The outer skin and inner skin are joined together to form a hollow slot frame. Multiple sets of rib boxes are arranged in an array. The rib boxes are located inside the hollow slot frame. The rib boxes and outer skin are connected by adhesive bonding. The inner skin is installed on the outer surface of the rib box by bolts and support nuts.

[0007] The reinforcing frame includes a front frame and a rear frame, which are respectively disposed at both ends of the empty slot frame.

[0008] Optionally, both ends of the outer skin are provided with reinforcing surfaces, which are provided in a manner corresponding to the front end frame and the rear end frame.

[0009] Optionally, the reinforcing surface is fixedly connected to the front frame and the rear frame by multiple sets of second countersunk bolts, one end of which is threaded with a self-locking nut.

[0010] Optionally, a first recessed groove is provided at one end of one side of the inner skin, and a second recessed groove is provided in the middle of one side of the inner skin.

[0011] Optionally, the rib box includes a first rib box and a second rib box. The rafters on the wider side of the first rib box and the outer skin are glued together, and the inner skin is connected with bolts and a support nut. The rafters on the narrower side of the first rib box are recessed.

[0012] Optionally, the first rib box and the second rib box are fixedly connected to the inner skin by multiple sets of first countersunk bolts, one end of which is threaded with a support plate nut, which is located inside the first rib box or the second rib box.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The first and second recessed grooves on one side of the inner skin of this utility model can realize the integrated manufacturing of the irregular cross section and the recessed oil tank. The oil tank can be made of composite materials, which can achieve the weight reduction of the oil tank.

[0015] 2. With the outer skin, inner skin and rib box set by this utility model, the number of rib boxes can be appropriately increased or decreased according to the pressure on the oil tank inside the composite material oil tank during use, so as to resist the pressure, which has strong design flexibility.

[0016] 3. The inner skin provided by this utility model is equivalent to a large detachable cover for the fuel tank, which facilitates the disassembly of the inner skin, thereby facilitating the maintenance of the fuel tank and its internal piping components and improving maintenance convenience. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure provided by this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the fuel tank after the inner skin has been removed, as provided by this utility model.

[0020] Figure 3 This is a schematic diagram of the composite material outer skin provided by this utility model;

[0021] Figure 4 This is a schematic diagram of the composite material inner skin provided by this utility model.

[0022] Figure 5 This is a schematic diagram of the first rib box of composite material provided by this utility model.

[0023] Figure 6 This is a schematic diagram of the composite material second rib box provided by this utility model.

[0024] Figure 7 This is a schematic diagram of the sealing plate nut provided by this utility model.

[0025] In the figure: 1. Outer skin; 2. Inner skin; 3. First recessed groove; 4. Second recessed groove; 5. Front end frame; 6. First rib box; 7. Second rib box; 8. Rear end frame; 9. First countersunk bolt; 10. Reinforcing surface; 11. Support plate nut; 12. Second countersunk bolt; 13. Self-locking nut. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figures 1 to 4 As shown in the embodiment of this utility model, a composite material fuel tank includes: an outer skin 1, an inner skin 2, and rib boxes. The outer skin 1 and the inner skin 2 are joined to form a hollow slot frame. Multiple sets of rib boxes are arranged in an array. The rib boxes are disposed inside the hollow slot frame, and both the outer skin 1 and the inner skin 2 can be detachably installed at the rib box's rib slats. A reinforcing frame includes a front frame 5 and a rear frame 8, which are respectively disposed at both ends of the hollow slot frame. The rib boxes include a first rib box 6 and a second rib box 7. The first rib box 6 and the second rib box 7 have a wider rib slat on one side and a narrower rib slat on the other side.

[0028] Specifically, such as Figure 1 and Figure 2As shown, after the outer skin 1, inner skin 2, first rib box 6, second rib box 7, and remaining rib boxes, front frame 5, and rear frame 8 of the composite material fuel tank are molded, the inner first rib box 6 and second rib box 7 are first bonded to the outer skin 1 on the mold frame with structural adhesive. No nails are needed for this connection, eliminating the risk of leakage. Then, the front frame 5 and rear frame 8 are installed. Both the front frame 5 and rear frame 8 are C-shaped, with the C-shaped flanges facing outwards, which facilitates the sealing of the connecting bolts. After the front frame 5 and rear frame 8 are positioned and installed... Subsequently, because the mounting surfaces of each first rib box 6 or second rib box 7 and inner skin 2 are open, it is beneficial for the installation and adjustment of pipelines. Finally, the inner skin 2 is installed. The inner skin 2 is located at the narrower rib of the first rib box 6 and the second rib box 7. Here, the inner skin 2 is equivalent to a large detachable cover for the fuel tank, which facilitates the later maintenance of the fuel tank and the pipeline components inside the fuel tank. Moreover, the number of rib boxes inside the composite material fuel tank can be appropriately increased or decreased according to the internal pressure of the fuel tank, which has strong design flexibility and improves practicality.

[0029] It should be noted that both the outer skin 1 and the inner skin 2 can be molded separately using a female mold because they take into account the shape of the fuel tank. Furthermore, the outer skin 1 is a part with variable thickness, which is an advantage of composite materials. During mold laying, the required variable thickness can be achieved through appropriate layer-by-layer laying treatment, thus improving applicability.

[0030] Furthermore, both ends of the outer skin 1 are provided with reinforcing surfaces 10, which are correspondingly provided with the front frame 5 and the rear frame 8.

[0031] Specifically, such as Figures 1 to 3 As shown, the front frame 5, the rear frame 8, and the internal first rib box 6 or the second rib box 7 can all be individually molded using a diaphragm. The front frame 5 and the rear frame 8 are both C-shaped structures, and the internal first rib box 6 and the second rib box 7 are C-shaped box structures. The web of the C-shaped rib box has a hole. On the one hand, the hole can reduce the weight of the rib box, and on the other hand, the hole can facilitate the passage of fuel lines inside the fuel tank. The first rib box 6 and the second rib box 7 are both reinforced structures of outer skin 1 and inner skin 2, which can effectively resist the pressure inside the fuel tank.

[0032] Furthermore, the reinforcing surface 10 is fixedly connected to the front frame 5 and the rear frame 8 by multiple sets of second countersunk bolts 12, one end of which is threaded with a self-locking nut 13.

[0033] Specifically, such as Figures 1 to 3 As shown, the second countersunk bolt 12 connecting the inner skin 2 to the front frame 5 and the rear frame 8 is located in the outer area of ​​the oil tank, that is, at the position of the reinforcing surface 10 of the outer skin 1. This position is not used to place the rib box, so it is an outer area. Therefore, the second countersunk bolt 12 is installed in this area, which is not only easy to seal, but also has no risk of leakage.

[0034] Furthermore, a first recessed groove 3 is provided at one end of one side of the inner skin 2, and a second recessed groove 4 is provided in the middle of one side of the inner skin 2; one end of the first rib box 6 is recessed.

[0035] Specifically, such as Figures 1 to 3 As shown, one end of the first rib box 6 is recessed to cooperate with the first recessed groove 3 and the second recessed groove 4. Through the first recessed groove 3 and the second recessed groove 4, the density of the composite material can be reduced, the fuel tank can be made lightweight, its pressure resistance is also guaranteed, and the integrated manufacturing of fuel tanks with irregular cross sections and recesses can be realized, reducing production costs.

[0036] Furthermore, the first rib box 6 and the second rib box 7 are fixedly connected to the inner skin 2 by multiple sets of first countersunk bolts 9. One end of the first countersunk bolt 9 is threaded with a support plate nut 11, which is located inside the first rib box 6 or the second rib box 7.

[0037] Specifically, such as Figure 1 , Figure 2 and Figure 4 As shown, the support plate nut 11 is set inside the first rib box 6 or the second rib box 7, and then the inner skin 2 is fixed by the first countersunk bolt 9. The inner skin 2 here is equivalent to a large detachable cover of the fuel tank, so as to facilitate the disassembly of the inner skin 2, thereby facilitating the maintenance of the fuel tank and the fuel tank pipeline components in the later stage and improving the convenience of maintenance.

[0038] The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A composite material fuel tank, characterized in that, include: The outer skin (1), inner skin (2) and rib box are connected to form a hollow slot frame. The rib boxes are arranged in an array of multiple sets. The rib boxes are located inside the hollow slot frame. The outer skin (1) and rib box are bonded together. The inner skin (2) is detachably installed at the rib box rib. The reinforcing frame includes a front frame (5) and a rear frame (8), which are respectively located at the front and rear ends of the empty slot frame.

2. The composite material fuel tank according to claim 1, characterized in that: The outer skin (1) has reinforcing surfaces (10) at both ends, and the reinforcing surfaces (10) are provided in a corresponding manner with the front frame (5) and the rear frame (8).

3. A composite material fuel tank according to claim 2, characterized in that: The reinforcing surface (10) is fixedly connected to the front frame (5) and the rear frame (8) by multiple sets of second countersunk bolts (12), one end of which is threaded with a self-locking nut (13).

4. A composite material fuel tank according to claim 3, characterized in that: The inner skin (2) has a first recessed groove (3) at one end of one side and a second recessed groove (4) at the middle of one side.

5. A composite material fuel tank according to claim 4, characterized in that: The rib box includes a first rib box (6) and a second rib box (7). The first rib box (6) and the second rib box (7) are provided with narrower rafters on one side. The inner skin (2) is located at the narrower rafters. One end of the first rib box (6) is recessed.

6. A composite material fuel tank according to claim 5, characterized in that: The first rib box (6) and the second rib box (7) are fixedly connected to the inner skin (2) by multiple sets of first countersunk bolts (9). One end of the first countersunk bolt (9) is threaded with a support plate nut (11), which is located inside the rafter of the first rib box (6) or the second rib box (7).

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