Aluminum honeycomb sandwich panel

Abstract

An aluminum honeycomb sandwich composite panel, which has gas passages formed therein for gas flow, comprises: an aluminum honeycomb core layer, which is arranged by a plurality of hollow aluminum honeycomb core cells; a first aluminum cover plate, which is connected to one axial end surface of the aluminum honeycomb core layer and forms a first connecting part; and a second aluminum cover plate, which is connected to the other axial end surface of the aluminum honeycomb core layer and forms a second connecting part, the first connecting part comprises a first ventilation groove, the second connecting part comprises a second ventilation groove, the first ventilation groove and the second ventilation groove form the gas passages, the cross-sectional area of the first ventilation groove is different from that of the second ventilation groove in the direction perpendicular to the gas flow direction, so that the flow resistance of the gas flowing therethrough is different, thereby forming a flow velocity difference between the gas passage where the first ventilation groove is located and the gas passage where the second ventilation groove is located, and further forming a pressure difference.

Description

Technical Field

[0001] This invention relates to the field of aircraft auxiliary fuel tank design, and more particularly to the field of aluminum honeycomb panel ventilation design. Background Technology

[0002] Previously, auxiliary fuel tanks in civil aircraft typically used an aluminum honeycomb sandwich composite panel as their shell, consisting of two complete aluminum cover plates sandwiching an aluminum honeycomb core layer. Liquid fuel within the auxiliary fuel tank frequently evaporates into fuel vapor, which leaks into the aluminum honeycomb core layer through easily leaking points such as the joints between adjacent aluminum honeycomb composite panels. If this gaseous fuel accumulates to a certain amount within the aluminum honeycomb cells, it increases the flammability of the auxiliary fuel tank, posing a risk of explosion.

[0003] Therefore, for safety reasons, the designers incorporated identical ventilation slots on the end walls of each aluminum honeycomb cell in the aluminum honeycomb core layer. This allows gas flowing into each aluminum honeycomb cell from the two ventilation slots to pass through the internal space of the cell, thus promptly expelling fuel vapors.

[0004] Despite this, the aluminum honeycomb sandwich composite panel constructed as described above still has the following shortcomings:

[0005] Firstly, in the aforementioned gas passage, the two sets of ventilation slots located at both ends of each aluminum honeycomb cell have the same shape. Therefore, the gas flowing through the two sets of ventilation slots has the same velocity and pressure. According to Bernoulli's principle, a pressure difference cannot be formed between the two ends of the aluminum honeycomb cell, and the gas cannot be driven to flow from one end of the axial direction to the other. Consequently, the gas tends to accumulate at the axial center of the aluminum honeycomb cell, failing to form a uniform airflow that penetrates the entire honeycomb core. Thus, ventilation and leakage blind spots are easily generated inside the aluminum honeycomb cell, resulting in low ventilation and leakage efficiency.

[0006] Secondly, the walls of aluminum honeycomb cores are generally thin, and slotting on the walls can easily cause the aluminum honeycomb cores to deform and the walls to turn up.

[0007] Third, when manufacturing slotted aluminum honeycomb core layers using the stretching method, ventilation slots are typically created on the end walls of each aluminum honeycomb cell to form gas passages. If the aluminum honeycomb core layer needs to be replaced, ventilation slots must be re-created for each aluminum honeycomb cell, making the manufacturing and replacement process complex. Summary of the Invention

[0008] The present invention was made in view of the above-mentioned technical problems, and its purpose is to provide an aluminum honeycomb sandwich composite panel that can not only form a uniform through airflow inside each aluminum honeycomb core, but also increase the ventilation airflow at the connection parts with a high risk of fuel vapor leakage in order to remove the fuel vapor accumulated there and improve ventilation and leakage efficiency.

[0009] To achieve the above objectives, a first aspect of the present invention provides an aluminum honeycomb sandwich composite panel, which has a gas passage for airflow inside, comprising: an aluminum honeycomb core layer, the aluminum honeycomb core layer being composed of a plurality of hollow aluminum honeycomb cells arranged together; a first aluminum cover plate, the first aluminum cover plate being connected to one axial end face of the aluminum honeycomb core layer and forming a first connection portion; and a second aluminum cover plate, the second aluminum cover plate being connected to the other axial end face of the aluminum honeycomb core layer and forming a second connection portion, the first connection portion including a first ventilation groove, the second connection portion including a second ventilation groove, the first ventilation groove and the second ventilation groove each forming the gas passage, the first ventilation groove and the second ventilation groove having different cross-sectional areas perpendicular to the airflow direction, so as to make the flow resistance of the gas passing through them different, thereby creating a flow velocity difference between the gas passage where the first ventilation groove is located and the gas passage where the second ventilation groove is located.

[0010] According to the above structure, the first connection part connecting the first aluminum cover plate and the aluminum honeycomb core layer at one end in the axial direction includes a first ventilation groove, and the second connection part connecting the second aluminum cover plate and the other end in the axial direction includes a second ventilation groove. The first ventilation groove and the second ventilation groove have different cross-sectional areas perpendicular to the airflow direction so that the flow resistance of the gas passing through them is different, thereby forming a flow velocity difference between the gas passage where the first ventilation groove is located and the gas passage where the second ventilation groove is located, and thus generating a pressure difference.

[0011] Therefore, when gas flows in through the gas passages of the first ventilation slot and the second ventilation slot respectively under the same driving force, due to the aforementioned pressure difference, the gas enters the aluminum honeycomb core cell under the drive of the aforementioned pressure difference and flows evenly inside it, which can reduce ventilation blind spots inside the aluminum honeycomb core cell and improve ventilation and leakage efficiency.

[0012] The aluminum honeycomb sandwich composite panel of the second aspect of the present invention is based on the aluminum honeycomb sandwich composite panel of the first aspect of the present invention, characterized in that the width of the cross section of the first ventilation groove in the direction perpendicular to the airflow direction is the same as the width of the cross section of the second ventilation groove in the direction perpendicular to the airflow direction, and the depth of the cross section of the first ventilation groove in the direction perpendicular to the airflow direction is greater than the depth of the cross section of the second ventilation groove in the direction perpendicular to the airflow direction.

[0013] According to the above structure, by forming the first ventilation slot and the second ventilation slot with the same width in the cross-section perpendicular to the airflow direction, but with the former having a greater depth than the latter, it is possible to achieve a gas flow velocity from the first ventilation slot being greater than that from the second ventilation slot through a simple structure.

[0014] Furthermore, the cross-sectional area of ​​the first ventilation slot perpendicular to the airflow direction is larger than that of the second ventilation slot. Therefore, the gas flow resistance is low, the gas velocity is high, and the gas pressure is low at the first ventilation slot, while the gas flow resistance is high, the gas velocity is low, and the gas pressure is high at the second ventilation slot. Thus, a positive pressure difference exists between the second and first ventilation slots. In this case, when the first ventilation slot is located near the fuel tank and the second ventilation slot is located away from the fuel tank, when gas flows in simultaneously through both ventilation slots, under the aforementioned positive pressure difference, the gas will be continuously directed towards the first connection point where the first ventilation slot, which has a higher risk of fuel vapor leakage, is located. This effectively removes fuel vapor accumulated at this location, improving ventilation and leak removal efficiency.

[0015] The aluminum honeycomb sandwich composite panel of the third aspect of the present invention is based on the aluminum honeycomb sandwich composite panel of the second aspect of the present invention, characterized in that the first ventilation groove of the first connecting portion is located on the first aluminum cover plate, and the second ventilation groove of the second connecting portion is located on the second aluminum cover plate.

[0016] According to the above structure, compared with the prior art where the first ventilation slot and the second ventilation slot are both formed on the two end walls of each aluminum honeycomb cell in the aluminum honeycomb core layer, it can avoid the deformation of the aluminum honeycomb cell and the wall edge turning out due to slotting on the two end walls of the aluminum honeycomb cell.

[0017] Moreover, when manufacturing aluminum honeycomb core layers, there is no need to create ventilation slots on each aluminum honeycomb cell, thus simplifying the manufacturing process of aluminum honeycomb core layers.

[0018] The aluminum honeycomb sandwich composite panel of the fourth aspect of the present invention is based on the aluminum honeycomb sandwich composite panel of the second aspect of the present invention, characterized in that the first ventilation groove of the first connecting portion is located on the first aluminum cover plate, and the second ventilation groove of the second connecting portion is located on the end of each aluminum honeycomb core cell of the aluminum honeycomb core layer near the second aluminum cover plate.

[0019] According to the above structure, the first ventilation groove of the first connection part is located on the first aluminum cover plate. Therefore, compared with the case in the prior art where the first ventilation groove is formed on the end of each aluminum honeycomb cell in the aluminum honeycomb core layer near the first aluminum cover plate, it can avoid the deformation of the aluminum honeycomb cell and the wall edge turning up due to the slotting on the end wall surface of each aluminum honeycomb cell near the first aluminum cover plate.

[0020] The fifth aspect of the aluminum honeycomb sandwich composite panel of the present invention is based on the second aspect of the present invention, characterized in that the first ventilation groove of the first connecting part is located on the end of each aluminum honeycomb core cell of the aluminum honeycomb core layer near the first aluminum cover plate, and the second ventilation groove of the second connecting part is located on the end of each aluminum honeycomb core cell of the aluminum honeycomb core layer near the second aluminum cover plate.

[0021] According to the above structure, the first ventilation slot and the second ventilation slot are located at the two ends of each aluminum honeycomb core cell of the aluminum honeycomb core layer. The cross-sectional area of ​​the first ventilation slot in the direction perpendicular to the airflow direction is larger than that of the second ventilation slot in the direction perpendicular to the airflow direction. Therefore, the gas flow resistance is small, the gas flow velocity is large, and the air pressure is small at the first ventilation slot. The gas flow resistance is large, the gas flow velocity is small, and the air pressure is large at the second ventilation slot. Therefore, there is a positive air pressure difference between the second ventilation slot and the first ventilation slot.

[0022] Thus, when gas flows in simultaneously through the gas passages of the first and second ventilation slots under the same driving force, due to the aforementioned positive pressure difference, the gas enters the aluminum honeycomb core cell and circulates evenly inside it, reducing ventilation blind spots inside the aluminum honeycomb core cell and improving ventilation and leakage efficiency.

[0023] Furthermore, since the risk of fuel vapor leakage at the first connection point where the first ventilation slot is located is greater than the risk at the second connection point where the second ventilation slot is located, under the aforementioned positive pressure difference, gas will be continuously sent to the first connection point where the first ventilation slot is located. This better removes the fuel vapor accumulated there, thereby improving ventilation and leak removal efficiency.

[0024] The aluminum honeycomb sandwich composite panel of the sixth aspect of the present invention is based on the aluminum honeycomb sandwich composite panel of the second aspect of the present invention, characterized in that the first ventilation groove of the first connecting portion is located on the end of each aluminum honeycomb core cell of the aluminum honeycomb core layer near the first aluminum cover plate, and the second ventilation groove of the second connecting portion is located on the second aluminum cover plate.

[0025] According to the above structure, the second ventilation groove of the second connection part is located on the second aluminum cover plate. Therefore, compared with the case in the prior art where the second ventilation groove is formed on the end of each aluminum honeycomb cell in the aluminum honeycomb core layer near the second aluminum cover plate, it can avoid the deformation of the aluminum honeycomb cell and the wall edge turning up due to the slotting on the end wall surface of each aluminum honeycomb cell near the second aluminum cover plate.

[0026] The aluminum honeycomb sandwich composite panel of the seventh aspect of the present invention is based on the aluminum honeycomb sandwich composite panel of the second aspect of the present invention, characterized in that the first ventilation groove of the first connecting portion is continuously formed in such a way that it spans the first aluminum cover plate and the aluminum honeycomb core layer near the end of each of the aluminum honeycomb core cells near the first aluminum cover plate, and the second ventilation groove of the second connecting portion is located on the second aluminum cover plate.

[0027] According to the above structure, the second ventilation groove of the second connection part is located on the second aluminum cover plate. Therefore, compared with the case in the prior art where the second ventilation groove is formed on the end of each aluminum honeycomb cell in the aluminum honeycomb core layer near the second aluminum cover plate, it can avoid the deformation of each aluminum honeycomb cell and the wall edge turning up due to the slotting on the end wall surface of each aluminum honeycomb cell near the second aluminum cover plate.

[0028] The aluminum honeycomb sandwich composite panel of the eighth aspect of the present invention is based on the aluminum honeycomb sandwich composite panel of the second aspect of the present invention, characterized in that the first ventilation groove of the first connecting portion is continuously formed across the first aluminum cover plate and the end of each aluminum honeycomb cell of the aluminum honeycomb core layer near the first aluminum cover plate, and the second ventilation groove of the second connecting portion is located on the end of each aluminum honeycomb cell of the aluminum honeycomb core layer near the second aluminum cover plate.

[0029] According to the above structure, the first ventilation slot is continuously formed across the ends of each aluminum honeycomb cell in the aluminum honeycomb core layer near the first aluminum cover plate, and the second ventilation slot is located on the ends of each aluminum honeycomb cell in the aluminum honeycomb core layer near the second aluminum cover plate. This enlarges the cross-sectional area of ​​the first ventilation slot perpendicular to the airflow direction, making it larger than the cross-sectional area of ​​the second ventilation slot in the same direction. Therefore, the first ventilation slot has low gas flow resistance, high gas velocity, and low air pressure, while the second ventilation slot has high gas flow resistance, low gas velocity, and high air pressure. Consequently, a positive pressure difference exists between the second and first ventilation slots.

[0030] Thus, when gas flows in simultaneously through the gas passages of the first and second ventilation slots under the same driving force, due to the aforementioned positive pressure difference, the gas enters the aluminum honeycomb core cell and circulates evenly inside it, reducing ventilation blind spots inside the aluminum honeycomb core cell and improving ventilation and leakage efficiency.

[0031] Furthermore, due to the positive pressure difference between the second ventilation slot and the first ventilation slot, gas will be continuously sent to the first connection point where the first ventilation slot is located. This allows for better removal of fuel vapor accumulated there, thereby improving ventilation and leak-proof efficiency.

[0032] The aluminum honeycomb sandwich composite panel of the ninth aspect of the present invention is based on the aluminum honeycomb sandwich composite panel of the second aspect of the present invention, characterized in that the first ventilation groove of the first connecting portion is located on the first aluminum cover plate, and the second ventilation groove of the second connecting portion is continuously formed in such a way that it spans the ends of each aluminum honeycomb core cell of the aluminum honeycomb core layer near the second aluminum cover plate and the second aluminum cover plate.

[0033] According to the above structure, the first ventilation groove of the first connection part is located on the first aluminum cover plate. Therefore, compared with the case in the prior art where the first ventilation groove is formed on the end of each aluminum honeycomb cell in the aluminum honeycomb core layer near the first aluminum cover plate, it can avoid the deformation of the aluminum honeycomb cell and the wall edge turning up due to the slotting on the end wall surface of each aluminum honeycomb cell near the first aluminum cover plate.

[0034] The aluminum honeycomb sandwich composite panel of the tenth aspect of the present invention is based on the aluminum honeycomb sandwich composite panel of the second aspect of the present invention, characterized in that the first ventilation groove of the first connecting portion is located on the end of each aluminum honeycomb core cell of the aluminum honeycomb core layer near the first aluminum cover plate, and the second ventilation groove of the second connecting portion is continuously formed in a manner that spans the end of each aluminum honeycomb core cell of the aluminum honeycomb core layer near the second aluminum cover plate and the second aluminum cover plate.

[0035] According to the above structure, the first ventilation slot is located on the end of each aluminum honeycomb cell in the aluminum honeycomb core layer near the first aluminum cover plate, and the second ventilation slot is continuously formed across the end of each aluminum honeycomb cell in the aluminum honeycomb core layer near the second aluminum cover plate and the second aluminum cover plate. Moreover, the ventilation area of ​​the first ventilation slot is larger than that of the second ventilation slot, which can create a positive pressure difference between the second ventilation slot and the first ventilation slot. Driven by this positive pressure difference, some of the gas in the second ventilation slot will be transported through the interior of each aluminum honeycomb cell to the first ventilation slot. Therefore, compared with the prior art, not only can the ventilation blind spots inside each aluminum honeycomb cell be reduced, but the gas can also be continuously delivered to the first connection part where the risk of fuel vapor leakage is high, so as to improve the ventilation and leakage efficiency.

[0036] The eleventh aspect of the aluminum honeycomb sandwich composite panel of the present invention is based on the aluminum honeycomb sandwich composite panel of the second aspect of the present invention, characterized in that the first ventilation groove of the first connecting portion is continuously formed in a manner that spans the first aluminum cover plate and the aluminum honeycomb core layer near the end of each of the aluminum honeycomb core cells near the first aluminum cover plate, and the second ventilation groove of the second connecting portion is continuously formed in a manner that spans the aluminum honeycomb core layer near the end of each of the aluminum honeycomb core cells near the second aluminum cover plate and the second aluminum cover plate.

[0037] According to the above structure, the first ventilation slot is continuously formed in such a way that each aluminum honeycomb cell spanning the first aluminum cover plate and the aluminum honeycomb core layer is close to the end of the first aluminum cover plate, and the second ventilation slot is continuously formed in such a way that each aluminum honeycomb cell spanning the aluminum honeycomb core layer is close to the end of the second aluminum cover plate and the second aluminum cover plate. That is, the first ventilation slot is formed at the first connection part where the risk of fuel vapor leakage is high, and the second ventilation slot is formed at the second connection part where the risk of fuel vapor leakage is low.

[0038] Because the cross-sectional area of ​​the first ventilation slot perpendicular to the airflow direction is larger than that of the second ventilation slot, the gas flow resistance is small, the gas flow velocity is large, and the air pressure is low at the first ventilation slot, while the gas flow resistance is large, the gas flow velocity is low, and the air pressure is high at the second ventilation slot. Therefore, there is a positive pressure difference between the second ventilation slot and the first ventilation slot.

[0039] Thus, with the first ventilation slot placed on the side of the auxiliary fuel tank closer to the fuel tank and the second ventilation slot placed on the side of the auxiliary fuel tank farther from the fuel tank, when gas flows in through the first and second ventilation slots respectively, under the aforementioned positive pressure difference, a portion of the gas will be continuously sent to the first ventilation slot, where the risk of fuel vapor leakage is higher. This reduces ventilation and leakage blind spots inside each aluminum honeycomb core cell through uniform through-flow, and better removes fuel vapor accumulated at the first connection point where the first ventilation slot is located, thereby improving ventilation and leakage efficiency.

[0040] The aluminum honeycomb sandwich composite panel of the twelfth aspect of the present invention is based on the aluminum honeycomb sandwich composite panel of any one of the first to eleventh aspects of the present invention, characterized in that the wall thickness of the first aluminum cover plate and the second aluminum cover plate is greater than the wall thickness of each aluminum honeycomb cell of the aluminum honeycomb core layer.

[0041] According to the above structure, the wall thickness of the first aluminum cover plate and the second aluminum cover plate is greater than the wall thickness of each aluminum honeycomb cell in the aluminum honeycomb core layer. Therefore, by forming the first ventilation groove and the second ventilation groove on the first aluminum cover plate and the second aluminum cover plate with relatively thicker walls, deformation and wall edge flipping of the aluminum honeycomb cells with relatively thinner walls can be avoided.

[0042] The aluminum honeycomb sandwich composite panel of the thirteenth aspect of the present invention is based on the aluminum honeycomb sandwich composite panel of any one of the first to eleventh aspects of the present invention, characterized in that it further includes an air inlet and an exhaust outlet, wherein the gas passage is formed between the air inlet and the exhaust outlet.

[0043] According to the above structure, the aluminum honeycomb sandwich composite panel also includes an air inlet and an exhaust outlet, and the gas passage is formed between the air inlet and the exhaust outlet. Therefore, a gas passage that allows gas to flow can be formed in the aluminum honeycomb sandwich composite panel. Attached Figure Description

[0044] To more clearly illustrate the technical solutions of the various embodiments of the present invention, the drawings used in each embodiment are briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0045] Figure 1 This is a perspective view of an aluminum honeycomb sandwich composite panel according to the first embodiment of the present invention.

[0046] Figure 2 It means Figure 1 The front view of the aluminum honeycomb sandwich composite panel shown.

[0047] Figure 3 It means Figure 1 The image shows a three-dimensional view of the aluminum honeycomb sandwich composite panel after the first aluminum cover plate has been removed.

[0048] Figure 4A This is a perspective view of an aluminum honeycomb sandwich composite panel after the first aluminum cover plate has been removed, representing a modified example of the first embodiment of the present invention.

[0049] Figure 4B This is a top view of an aluminum honeycomb sandwich composite panel after the first aluminum cover plate has been removed, representing a modified example of the first embodiment of the present invention.

[0050] Figure 5 This is a front view of the aluminum honeycomb sandwich composite panel according to the second embodiment of the present invention.

[0051] Figure 6 This is a front view of the aluminum honeycomb sandwich composite panel according to the third embodiment of the present invention.

[0052] Figure 7 This is a front view of the aluminum honeycomb sandwich composite panel according to the fourth embodiment of the present invention.

[0053] Figure 8 This is a front view showing the aluminum honeycomb sandwich composite panel according to the fifth embodiment of the present invention.

[0054] Figure 9 This is a front view of the aluminum honeycomb sandwich composite panel according to the sixth embodiment of the present invention.

[0055] Figure 10 This is a front view of the aluminum honeycomb sandwich composite panel according to the seventh embodiment of the present invention.

[0056] Figure 11 This is a front view showing the aluminum honeycomb sandwich composite panel according to the eighth embodiment of the present invention.

[0057] Figure 12 This is a front view of the aluminum honeycomb sandwich composite panel according to the ninth embodiment of the present invention.

[0058] Figure 13 This is a schematic diagram illustrating the application of the aluminum honeycomb sandwich composite panel of the present invention to the outer shell of an auxiliary fuel tank of a civil aircraft.

[0059] (Symbol Explanation)

[0060] 1. Aluminum honeycomb sandwich composite panel;

[0061] 2. First aluminum cover plate;

[0062] 21. First ventilation slot;

[0063] 3. Aluminum honeycomb core layer;

[0064] 31. Aluminum honeycomb core;

[0065] 4. Second aluminum cover plate;

[0066] 41. Second ventilation slot;

[0067] Depth of the first ventilation slot H1;

[0068] Depth of the second ventilation slot in H2;

[0069] 1' Aluminum honeycomb sandwich composite panel;

[0070] 4. Second aluminum cover plate;

[0071] 41' Second ventilation slot;

[0072] 1A aluminum honeycomb sandwich composite panel;

[0073] 312A Second Ventilation Slot;

[0074] Depth of the first ventilation slot in H1A;

[0075] Depth of the H2A second ventilation slot;

[0076] 1B aluminum honeycomb sandwich composite panel;

[0077] 311B First ventilation slot;

[0078] 312B Second ventilation slot;

[0079] The depth of the first ventilation slot in H1B;

[0080] Depth of the H2B second ventilation slot;

[0081] 1C aluminum honeycomb sandwich composite panel;

[0082] 311C First ventilation slot;

[0083] 41C Second ventilation slot;

[0084] Depth of the first ventilation slot in H1C;

[0085] Depth of the H2C second ventilation slot;

[0086] 1D aluminum honeycomb sandwich composite panel;

[0087] 311D First ventilation slot;

[0088] 41D Second ventilation slot;

[0089] Depth of the first ventilation slot in H1D;

[0090] Depth of the H2D second ventilation slot;

[0091] 1E aluminum honeycomb sandwich composite panel;

[0092] 311E First ventilation slot;

[0093] 312E Second ventilation slot;

[0094] Depth of the first ventilation slot in H1E;

[0095] Depth of the second ventilation slot in H2E;

[0096] 1F aluminum honeycomb sandwich composite panel;

[0097] 21F First ventilation slot;

[0098] 312F Second Ventilation Slot;

[0099] Depth of the first ventilation slot in H1F;

[0100] Depth of the second ventilation slot in H2F;

[0101] 1G aluminum honeycomb sandwich composite panel;

[0102] 311G First ventilation slot;

[0103] 312G Second ventilation slot;

[0104] The depth of the first ventilation slot in H1G;

[0105] Depth of the H2G second ventilation slot;

[0106] 1H aluminum honeycomb sandwich composite panel;

[0107] 211H First ventilation slot;

[0108] 312H Second ventilation slot;

[0109] Depth of the first ventilation slot in H1H;

[0110] Depth of the H2H second ventilation slot;

[0111] 5. Auxiliary fuel tank;

[0112] 51. The outer casing of the auxiliary fuel tank;

[0113] 511 Open at the top;

[0114] 512 Open at the bottom;

[0115] 6. Ventilation ductwork;

[0116] 61 External piping at the top;

[0117] 62 External pipes at the bottom. Detailed Implementation

[0118] The following is for reference Figures 1 to 13 The aluminum honeycomb sandwich composite panels of various embodiments and variations of the present invention will be described in detail.

[0119] like Figure 13 As shown, the aluminum honeycomb sandwich composite panel 1 of the present invention is used to form the side wall of the outer shell 51 of the auxiliary fuel tank 5. Existing aluminum honeycomb sandwich composite panels with ventilation slots of the same shape formed at both ends of the aluminum honeycomb core layer are used to form the upper and lower walls of the outer shell 51 of the auxiliary fuel tank 5.

[0120] A top opening 511 is formed at the top of the outer shell 51 of the auxiliary fuel tank 5, and an external pipe 61 at the top is connected to the outer shell 51 of the auxiliary fuel tank 5 through the top opening 511. A bottom opening 512 is formed at the bottom of the outer shell 51 of the auxiliary fuel tank 5, and the bottom opening 512 is connected to the external pipe 62 at the bottom.

[0121] Thus, when gas is forced into the housing 51 from the top opening 511 through the external pipe 61 at the top, the gas flows to both sides in the upper wall of the housing 51 as shown by the arrows in the figure, and flows downward in the side wall of the housing 51, then flows into the lower wall of the housing 51, and flows out from the bottom external pipe 62 through the bottom opening 512.

[0122] As the upper and lower walls of the outer shell 51, the existing aluminum honeycomb sandwich composite panel consists of two aluminum cover plates stacked on both axial ends of the aluminum honeycomb core layer. Ventilation slots of the same shape are formed on the axial end walls of each aluminum honeycomb cell in the aluminum honeycomb core layer. The axial direction of the aluminum honeycomb core layer is consistent with the vertical direction in the figure.

[0123] As the sidewall of the outer shell 51, the aluminum honeycomb sandwich composite panel of the present invention is configured with two aluminum cover plates respectively stacked at both ends of the aluminum honeycomb core layer. A first ventilation groove and a second ventilation groove are formed at both ends of each aluminum honeycomb cell in the aluminum honeycomb core layer, wherein the axial direction of the aluminum honeycomb core layer is consistent with the left-right direction in the figure. The cross-sectional area of ​​the first ventilation groove perpendicular to the airflow direction is larger than the cross-sectional area of ​​the second ventilation groove perpendicular to the airflow direction. That is, the gas velocity at the first ventilation groove is greater than the gas velocity at the second ventilation groove. Therefore, in the following embodiments and variations of the present invention, the first ventilation groove is disposed on the inner wall panel side closer to the fuel oil sidewall, and the second ventilation groove is disposed on the outer wall panel side away from the fuel oil sidewall. This facilitates increasing the ventilation airflow at the inner wall panel where fuel vapor is more easily accumulated, thereby improving ventilation and leakage removal efficiency.

[0124] In addition, such as Figure 13 As shown, most of the gas flowing from the upper wall of the outer casing 51 into the side wall flows directly downward to the lower wall through the first and second ventilation slots of the side wall plate, carrying away the fuel vapor in the ventilation slots. Meanwhile, another part of the gas, driven by the positive pressure difference between the second and first ventilation slots, flows from the second ventilation slot through the interior of the aluminum honeycomb core to the first ventilation slot, and then flows downward to the lower wall, carrying away the fuel vapor inside the aluminum honeycomb core.

[0125] like Figures 1 to 12 As shown, in the aluminum honeycomb sandwich composite panel 1 of the present invention, the first aluminum cover plate and the second aluminum cover plate have the same shape, both being cuboid. Therefore, for ease of explanation, the short side direction of the first aluminum cover plate is designated as the X direction, one side of the X direction is designated as the X1 side, and the other side is designated as the X2 side; the long side direction is designated as the Y direction, one side of the Y direction is designated as the Y1 side, and the other side is designated as the Y2 side; the height direction is designated as the Z direction, one side of the Z direction is designated as the Z1 side, and the other side is designated as the Z2 side.

[0126] (First Implementation)

[0127] In this embodiment, such as Figure 1 As shown, the aluminum honeycomb sandwich composite panel 1 is formed by bonding a first aluminum cover plate 2 to the Z1 side end face of the aluminum honeycomb core layer 3 and bonding a second aluminum cover plate 4 to the Z2 side end face of the aluminum honeycomb core layer 3.

[0128] The first aluminum cover plate 2 and the second aluminum cover plate 4 are both made of aluminum alloy and are formed into a cuboid shape with a length (i.e., the dimension in the Y direction) of 1320 mm, a width (i.e., the dimension in the X direction) of 910 mm, and a wall thickness of 2 mm. Figure 3 As shown, the aluminum honeycomb core layer 3 is composed of 16*20=320 aluminum honeycomb core cells 31 (only a part is shown in the figure). Each aluminum honeycomb core cell 31 is a hollow hexagonal prism with a wall thickness of 0.08mm.

[0129] like Figure 1 , 2 As shown, a first ventilation groove 21 is formed on the Z2 side end of the first aluminum cover plate 2, recessed to a depth H1 from the Z2 side end to the Z1 side, meaning the first ventilation groove 21 opens onto the Z2 side end face of the first aluminum cover plate 2. The first ventilation groove 21 extends in the Y direction and is formed in parallel in the X direction with 16 grooves, each corresponding to 20 aluminum honeycomb cells 31 arranged in a row in the Y direction. A second ventilation groove 41 is formed on the Z1 side end of the second aluminum cover plate 4, recessed to a depth H2 from the Z1 side end to the Z2 side, meaning the second ventilation groove 41 opens onto the Z1 side end face of the second aluminum cover plate 4. The second ventilation groove 41 is aligned with the first ventilation groove 21 in the Z direction and extends in the Y direction, forming 16 grooves in parallel in the X direction, each corresponding to 20 aluminum honeycomb cells 31 arranged in a row in the Y direction.

[0130] By setting the first ventilation slot 21 and the second ventilation slot 41 in the manner described above, as follows: Figure 1 As shown, in the Y direction, the first ventilation slots 21 of each aluminum honeycomb core 31 continuously form a first gas passage, and the second ventilation slots 41 of each aluminum honeycomb core 31 continuously form a second gas passage. Most of the gas flowing in from the Y1 direction flows out from the Y2 direction through the first gas passage and the second gas passage, while another part of the gas flows out from the first ventilation slot 21 through the third gas passage (which extends along the axial direction of the aluminum honeycomb core 31) from the second ventilation slot 41 of the second aluminum cover plate 4 through the interior of the aluminum honeycomb core 31 to the first ventilation slot 21 of the first aluminum cover plate 2, thereby carrying away the fuel vapor accumulated inside the aluminum honeycomb core 31.

[0131] As described above, the first ventilation slot 21 is formed at the first connection point between the first aluminum cover plate 2 and the aluminum honeycomb core layer 3 (in this embodiment, the connection between the first aluminum cover plate 2 and the aluminum honeycomb core layer 3), and the second ventilation slot 41 is formed at the second connection point between the second aluminum cover plate 4 and the aluminum honeycomb core layer 3 (in this embodiment, the connection between the second aluminum cover plate 4 and the aluminum honeycomb core layer 3). The first aluminum cover plate 2 constitutes the inner wall plate of the auxiliary fuel tank 5 and is in direct contact with the fuel. Therefore, the first connection point is the part with a high risk of fuel vapor leakage. The second aluminum cover plate 4 is the outer wall plate of the auxiliary fuel tank and is far away from the fuel and in contact with the external environment. Therefore, the second connection point is the part with a low risk of fuel vapor leakage.

[0132] The first ventilation slot 21 has a large cross-sectional area perpendicular to the airflow direction, resulting in low gas flow resistance, high airflow velocity, and low air pressure. The second ventilation slot 41 has a small cross-sectional area perpendicular to the airflow direction, resulting in high gas flow resistance, low airflow velocity, and high air pressure. This creates a positive pressure difference from the second ventilation slot to the first ventilation slot. Thus, in the third gas passage, under the influence of this positive pressure difference, gas flows from the second ventilation slot through the interior of each aluminum honeycomb core cell to the first ventilation slot, carrying away fuel vapor accumulated at the first connection point where there is a high risk of fuel vapor leakage, thereby improving ventilation and leak removal efficiency.

[0133] Specifically, refer to Figure 2 Within the XZ plane (i.e., the plane perpendicular to the airflow direction), the cross-sections of the first ventilation slot 21 and the second ventilation slot 41 (i.e., the cross-sections perpendicular to the airflow direction) are rectangular. Specifically, as follows... Figure 2 As shown, the width (i.e., the dimension in the X direction) of the first ventilation slot 21 is the same as the width (i.e., the dimension in the X direction) of the second ventilation slot 41, and the depth H1 (i.e., the specified dimension in the Z direction) of the first ventilation slot 21 is greater than the depth H2 of the second ventilation slot 41. Thus, the cross-sectional area of ​​the first ventilation slot 21 in the XZ plane is greater than the cross-sectional area of ​​the second ventilation slot 41 in the XZ plane.

[0134] When gas flows in along the Y direction, the first ventilation slot 21 has a large cross-sectional area and low flow resistance in the XZ plane, resulting in a higher gas velocity. Conversely, the second ventilation slot 41 has a small cross-sectional area and high flow resistance in the XZ plane, resulting in a lower gas velocity. In other words, the gas velocity on the Z1 side of each aluminum honeycomb cell 31 is greater than the gas velocity on the Z2 side. According to Bernoulli's principle in fluid mechanics, the higher the gas velocity, the lower the gas pressure. Therefore, the gas pressure P1 on the Z1 side of each aluminum honeycomb cell 31 is less than the gas pressure P2 on the Z2 side, creating a positive pressure difference ΔP = P2 - P1. Under the influence of this positive pressure difference ΔP, some of the gas on the Z2 side of each aluminum honeycomb cell 31 flows smoothly through its interior to the Z1 side, thus forming a uniform through-flow within each aluminum honeycomb cell 31. Furthermore, this airflow continuously flows towards the first connection point where the first ventilation slot 21, which has a higher risk of fuel vapor leakage, is located. This not only reduces ventilation and leakage blind spots inside each aluminum honeycomb core 31, but also increases the ventilation airflow at the first connection point where the risk of fuel vapor leakage is high, so as to remove the fuel vapor accumulated there and improve ventilation and leakage efficiency.

[0135] As described above, the wall thickness of the first aluminum cover plate 2 and the second aluminum cover plate 4 is greater than the wall thickness of the wall surfaces of each aluminum honeycomb cell 31 of the aluminum honeycomb core layer 3. Both the first ventilation groove 21 and the second ventilation groove 41 are located on the first aluminum cover plate 2 and the second aluminum cover plate 4 with relatively greater wall thickness. Therefore, compared with the prior art where the first ventilation groove and the second ventilation groove are respectively located at the ends on the Z1 and Z2 sides of each aluminum honeycomb cell 31 of the aluminum honeycomb core layer with relatively smaller wall thickness, deformation of the ends on the Z1 and Z2 sides of each aluminum honeycomb cell 31 and flanging of the wall surface can be avoided.

[0136] Moreover, as described above, the first ventilation groove 21 and the second ventilation groove 41 are aligned in the Z direction, which can make the distance from the first ventilation groove 21 to the second ventilation groove 41 the shortest. In this way, the gas passage can be shortened as much as possible to facilitate the flow of gas.

[0137] In addition, since both the first ventilation groove 21 and the second ventilation groove 41 are located on the aluminum cover plate, unlike the prior art where they are located on the end wall surfaces on the Z1 and Z2 sides of each aluminum honeycomb cell 31 of the aluminum honeycomb core layer 3, when manufacturing the aluminum honeycomb core layer, there is no need for complex processes such as opening ventilation grooves on each aluminum honeycomb cell and forming gas passages as in the prior art. Therefore, the manufacturing process can be simplified.

[0138] (Variant of the first embodiment)

[0139] In the above first embodiment, as Figure 2 and Figure 3 shown, the projected shapes of the 16 first ventilation grooves 21 of the first aluminum cover plate 2 and the 16 second ventilation grooves 41 of the second aluminum cover plate 4 in the XY plane are all rectangular and parallel to each other. However, the present invention is not limited thereto. As Figure 4A shown, in the aluminum honeycomb sandwich composite plate 1' of this variant, the cross-sectional shapes of the three mutually intersecting second ventilation grooves 41' in the XY plane are in the shape of a "rice" character. Although not specifically illustrated in this Figure 4A 、 4B correspondingly, the cross-sectional shapes of the three first ventilation grooves 21 formed on the first aluminum cover plate 2 in the XY plane are also in the shape of a "rice" character.

[0140] As Figure 4B shown, in the XY plane, each of the three second ventilation grooves 41' passes through the centers of the opposite two sides of the hexagon of the aluminum honeycomb cell 31 and intersects to form a "rice" character, and the intersection point of the "rice" character is located at the center of the hexagon. Similarly, although not illustrated, each of the three first ventilation grooves 21 passes through the centers of the opposite two sides of the hexagon of the aluminum honeycomb cell 31 and intersects to form a "rice" character, and the intersection point of the "rice" character is located at the center of the hexagon.

[0141] Furthermore, all three first ventilation slots 21 are formed on the Z2 side end of the first aluminum cover plate 2, and are recessed from the Z2 side end of the first aluminum cover plate 2 towards the Z1 side. All three second ventilation slots 41' are formed on the Z1 side end of the second aluminum cover plate 4, and are recessed from the Z1 side end of the second aluminum cover plate 4 towards the Z2 side.

[0142] According to the aluminum honeycomb sandwich composite panel 1' of this modified example, similarly to the first embodiment described above, the first ventilation groove 21 and the second ventilation groove 41' are located on the aluminum cover plate with a relatively large wall thickness. Therefore, compared with the case in the prior art where the first ventilation groove and the second ventilation groove are both located on the wall surface of the Z1 and Z2 side ends of each aluminum honeycomb core cell 31 of the aluminum honeycomb core layer with a relatively small wall thickness, deformation of the Z1 and Z2 side ends of each aluminum honeycomb core cell 31 and wall edge flipping can be avoided.

[0143] Furthermore, similar to the first embodiment described above, in the XZ plane, the width of the first ventilation slot 21 and the second ventilation slot 41' are both rectangular and have the same width, but the depth of the first ventilation slot 21 is greater than the depth of the second ventilation slot 41'. Therefore, the cross-sectional area of ​​the first ventilation slot 21 in the XZ plane is greater than the cross-sectional area of ​​the second ventilation slot 41' in the XZ plane. Thus, when gas flows in along a direction perpendicular to the XZ plane (i.e., the Y direction), the gas velocity passing through the first ventilation slot 21 is greater than the gas velocity passing through the second ventilation slot 41'. In other words, the gas velocity on the Z1 side of each aluminum honeycomb cell 31 is greater than the gas velocity on the Z2 side. According to Bernoulli's principle in fluid mechanics, the greater the gas velocity, the lower the gas pressure. The gas pressure P1' on the Z1 side of each aluminum honeycomb cell 31 is less than the gas pressure P2' on the Z2 side, i.e., a positive pressure difference ΔP' = P2' - P1' is formed. Under the aforementioned positive pressure difference ΔP', the gas on the Z2 side of each aluminum honeycomb cell 31 flows smoothly through its interior to the Z1 side, thereby forming a uniform through-flow within each aluminum honeycomb cell 31. This not only reduces ventilation and leakage blind spots within each aluminum honeycomb cell 31 but also increases the ventilation airflow at the first connection point, where the risk of fuel vapor leakage is higher, to remove accumulated fuel vapor and improve ventilation and leakage efficiency.

[0144] Furthermore, similar to the first embodiment described above, since both the first ventilation slot 21 and the second ventilation slot 41' are located on the aluminum cover plate, unlike in the prior art where they are located on the Z1 and Z2 sides of each aluminum honeycomb cell 31 of the aluminum honeycomb core layer 3, the complex process of creating ventilation slots on each aluminum honeycomb cell to form a gas passage is not required when manufacturing the aluminum honeycomb core layer, as is the case in the prior art. Therefore, the manufacturing process can be simplified.

[0145] (Second Implementation)

[0146] The above combination Figure 1Figure 4 illustrates the aluminum honeycomb sandwich composite panel 1 of the first embodiment and its modified aluminum honeycomb sandwich composite panel 1' in detail. Hereinafter, reference will be made to… Figure 5 The aluminum honeycomb sandwich composite panel 1A according to the second embodiment of the present invention will be described. For example... Figure 5 As shown, the aluminum honeycomb core sandwich composite panel 1A of the second embodiment is formed by bonding a first aluminum cover plate 2 to the Z1 side end face of the aluminum honeycomb core layer 3 and bonding a second aluminum cover plate 4 to the Z2 side end face of the aluminum honeycomb core layer 3. A first ventilation groove 21 in the shape of a cuboid with a depth H1A recessed from the Z2 side end face to the Z1 side is formed on the Z2 side end face of the first aluminum cover plate 2, that is, the first ventilation groove 21 opens at the Z2 side end face of the first aluminum cover plate 2. For parts that are the same as those in the first embodiment and its variations, the same reference numerals are used and the description is omitted.

[0147] In this embodiment, the second ventilation groove 312A is located on the Z2 side end wall of each aluminum honeycomb cell 31 of the aluminum honeycomb core layer 3, and is formed as a groove with a depth H2A recessed from the Z2 side end face of each aluminum honeycomb cell 31 to the Z1 side.

[0148] In addition, such as Figure 5 As shown, in the XZ plane, both the first ventilation slot 21 and the second ventilation slot 312A are rectangular. This forms a third gas passage from the second ventilation slot 312A through the interior of each aluminum honeycomb core 31 to the first ventilation slot 21.

[0149] In addition, such as Figure 5 As shown, in the XZ plane, the width of the first ventilation slot 21 is the same as the width of the second ventilation slot 312A, and the depth H1A of the first ventilation slot 21 is greater than the depth H2A of the second ventilation slot 312A. Therefore, the cross-sectional area of ​​the first ventilation slot 21 in the XZ plane is greater than the cross-sectional area of ​​the second ventilation slot 312A in the XZ plane. Thus, when gas flows in along a direction perpendicular to the XZ plane (i.e., the Y direction), the gas velocity passing through the first ventilation slot 21 is greater than the gas velocity passing through the second ventilation slot 312A. According to Bernoulli's principle in fluid mechanics, the greater the gas velocity, the lower the gas pressure. The gas pressure P1A on the Z1 side of each aluminum honeycomb cell 31 is less than the gas pressure P2A on the Z2 side, forming a positive pressure difference ΔPA = P2A - P1A. Under the action of the above positive pressure difference ΔPA, the gas on the Z2 side of each aluminum honeycomb cell 31 flows smoothly through its interior to the Z1 side, thereby forming a uniform through-flow within each aluminum honeycomb cell 31. This not only reduces ventilation and leakage blind spots inside each aluminum honeycomb core 31, but also increases the ventilation airflow at the first connection point where the risk of fuel vapor leakage is high, so as to remove the fuel vapor accumulated there and improve ventilation and leakage efficiency.

[0150] According to the above structure, the first ventilation slot 21 is located on the first aluminum cover plate 2 with a relatively large wall thickness. Therefore, similar to the above embodiments and their variations, deformation of the ends of each aluminum honeycomb core 31 near the first aluminum cover plate 2 and wall edge flipping can be avoided.

[0151] Furthermore, since the first ventilation slot 21 is formed on the first aluminum cover plate 2, the manufacturing process can be simplified, similar to the above embodiments and their variations.

[0152] (Third Implementation)

[0153] The following is for reference Figure 6 The aluminum honeycomb sandwich composite panel 1B according to the third embodiment of the present invention will be described. For example... Figure 6 As shown, the aluminum honeycomb sandwich composite panel 1B of the third embodiment is formed by bonding a first aluminum cover plate 2 to the Z1 side end face of the aluminum honeycomb core layer 3 and bonding a second aluminum cover plate 4 to the Z2 side end face of the aluminum honeycomb core layer 3. For parts in the above structure that are the same as those in the above embodiments and their variations, the same markings are used and descriptions are omitted.

[0154] In this embodiment, the first ventilation slot 311B is located on the Z1 side end of the aluminum honeycomb core layer 3 (i.e., the end near the first aluminum cover plate 2), and the second ventilation slot 312B is located on the Z2 side end of the aluminum honeycomb core layer 3 (i.e., the end near the second aluminum cover plate 4).

[0155] like Figure 6 As shown, in the XZ plane, the shapes of the first ventilation slot 311B and the second ventilation slot 312B are different from those in the above embodiments and their variations. The first ventilation slot 311B is a U-shaped slot with a maximum depth of H1B, recessed from the Z1 side end of each aluminum honeycomb cell 31 of the aluminum honeycomb core layer 3 towards the Z2 side. The second ventilation slot 312B is a U-shaped slot with a maximum depth of H2B, recessed from the Z2 side end of each aluminum honeycomb cell 31 of the aluminum honeycomb core layer 3 towards the Z1 side. This forms a third gas passage from the second ventilation slot 312B through the interior of each aluminum honeycomb cell 31 to the first ventilation slot 311B.

[0156] In addition, such as Figure 6As shown, the maximum width of the first ventilation slot 311B is the same as the maximum width of the second ventilation slot 312B, and the maximum depth H1B of the first ventilation slot 311B is greater than the maximum depth H2B of the second ventilation slot 312B. Therefore, the cross-sectional area of ​​the first ventilation slot 311B in the XZ plane is greater than the cross-sectional area of ​​the second ventilation slot 312B in the XZ plane. Thus, when gas flows in along a direction perpendicular to the XZ plane (i.e., the Y direction), the gas velocity passing through the first ventilation slot 311B is greater than the gas velocity passing through the second ventilation slot 312B. According to Bernoulli's principle in fluid mechanics, the greater the gas velocity, the lower the gas pressure. The gas pressure P1B on the Z1 side of each aluminum honeycomb cell 31 is less than the gas pressure P2B on the Z2 side, forming a positive pressure difference ΔPB = P2B - P1B. Under the influence of the positive pressure difference ΔPB, a uniform through airflow will be formed inside each aluminum honeycomb core 31. This not only reduces blind spots in ventilation and leakage inside the aluminum honeycomb core, but also increases the ventilation airflow at the first connection part where the risk of fuel vapor leakage is high, so as to remove the fuel vapor accumulated there and improve ventilation and leakage efficiency.

[0157] (Fourth Implementation)

[0158] The following is for reference Figure 7 The aluminum honeycomb sandwich composite panel 1C according to the fourth embodiment of the present invention will be described. For example... Figure 7 As shown, the aluminum honeycomb sandwich composite panel 1C of the fourth embodiment is formed by bonding a first aluminum cover plate 2 to the Z1 side end face of the aluminum honeycomb core layer 3 and bonding a second aluminum cover plate 4 to the Z2 side end face of the aluminum honeycomb core layer 3. For parts in the above structure that are the same as those in the above embodiments and their variations, the same markings are used and descriptions are omitted.

[0159] In this embodiment, such as Figure 7 As shown, the first ventilation slot 311C is located on the Z1 side end of the aluminum honeycomb core cell 31 of the aluminum honeycomb core layer 3, and the second ventilation slot 41C is located on the second aluminum cover plate 4.

[0160] Within the XZ plane, the first ventilation slot 311C is formed as a U-shaped slot recessed from the Z1 side end of each aluminum honeycomb core 31 towards the Z2 side, with a maximum depth of H1C. The second ventilation slot 41C is formed as a rectangular groove recessed from the Z1 side end of the second aluminum cover plate 4 towards the Z2 side, with a maximum depth of H2C. This creates a third gas passage from the second ventilation slot 41C through the interior of each aluminum honeycomb core 31 to the first ventilation slot 311C.

[0161] In addition, such as Figure 7As shown, the maximum width of the first ventilation slot 311C is the same as the width of the second ventilation slot 41C, and the maximum depth H1C of the first ventilation slot 311C is greater than the depth H2C of the second ventilation slot 41C. Therefore, the cross-sectional area of ​​the first ventilation slot 311C in the XZ plane is greater than the cross-sectional area of ​​the second ventilation slot 41C in the XZ plane. Thus, when gas flows in along a direction perpendicular to the XZ plane (i.e., the Y direction), the gas velocity passing through the first ventilation slot 311C is greater than the gas velocity passing through the second ventilation slot 41C. According to Bernoulli's principle in fluid mechanics, the greater the gas velocity, the lower the gas pressure. The gas pressure P1C on the Z1 side of each aluminum honeycomb cell 31 is less than the gas pressure P2C on the Z2 side, thereby forming a positive pressure difference ΔPC = P2C - P1C. Under the action of the positive pressure difference ΔPC, a uniform through airflow will be formed inside each aluminum honeycomb core cell 31. This not only reduces the blind spots of ventilation and leakage inside the aluminum honeycomb core cell, but also increases the ventilation airflow at the first connection part where the risk of fuel vapor leakage is high, so as to remove the fuel vapor accumulated there and improve the ventilation and leakage efficiency.

[0162] In addition, the second ventilation slot 41C is located on the second aluminum cover plate 4 with a relatively large wall thickness, so it can avoid deformation of the Z2 side end of each aluminum honeycomb core cell 31 of the aluminum honeycomb core layer and the wall edge turning up.

[0163] Furthermore, since the second ventilation slot 41C is located on the second aluminum cover plate 4, the manufacturing process can be simplified, similar to the above embodiments and their variations.

[0164] (Fifth Implementation)

[0165] The following is for reference Figure 8 The fifth embodiment of the aluminum honeycomb sandwich composite panel 1D of the present invention will be described. For example... Figure 8 As shown, the aluminum honeycomb sandwich composite panel 1D of the fifth embodiment is formed by bonding a first aluminum cover plate 2 to the Z1 side end face of the aluminum honeycomb core layer 3 and bonding a second aluminum cover plate 4 to the Z2 side end face of the aluminum honeycomb core layer 3. For parts in the above structure that are the same as those in the above embodiments and their variations, the same markings are used and descriptions are omitted.

[0166] In this embodiment, such as Figure 8As shown, a portion of the first ventilation groove 311D is located on the Z2 side end of the first aluminum cover plate 2 and is recessed from the Z2 side end of the first aluminum cover plate 2 towards the Z1 side. Another portion is located on the Z1 side end of each aluminum honeycomb cell 31 of the aluminum honeycomb core layer 3 and is recessed from the Z1 side end of each aluminum honeycomb cell 31 towards the Z2 side. Thus, the first ventilation groove 311D is formed as a groove of depth H1D that is continuously formed across the first aluminum cover plate 2 and the Z1 side end of each aluminum honeycomb cell 31. The second ventilation groove 41D is located on the second aluminum cover plate 4 and is formed as a cuboid-shaped groove of depth H2D that is recessed from the Z1 side end towards the Z2 side.

[0167] In the XZ plane, both the first ventilation slot 311D and the second ventilation slot 41D are rectangular. This forms a third gas passage from the second ventilation slot 41D through the interior of the aluminum honeycomb core 31 to the first ventilation slot 311D.

[0168] In addition, such as Figure 8 As shown, in the XZ plane, the width of the first ventilation slot 311D is the same as the width of the second ventilation slot 41D, and the depth H1D of the first ventilation slot 311D is greater than the depth H2D of the second ventilation slot 41D. Therefore, the cross-sectional area of ​​the first ventilation slot 311D in the XZ plane is greater than the cross-sectional area of ​​the second ventilation slot 41D in the XZ plane. Thus, when gas flows in along a direction perpendicular to the XZ plane (i.e., the Y direction), the gas velocity passing through the first ventilation slot 311D is greater than the gas velocity passing through the second ventilation slot 41D. According to Bernoulli's principle in fluid mechanics, the greater the gas velocity, the lower the gas pressure. The gas pressure P1D on the Z1 side of each aluminum honeycomb cell 31 is less than the gas pressure P2D on the Z2 side, forming a positive pressure difference ΔPD = P2D - P1D. Under the action of this positive pressure difference ΔPD, a uniform through-flow will be formed inside each aluminum honeycomb cell 31. This not only reduces blind spots in ventilation and leakage within the aluminum honeycomb core, but also increases the airflow at the first connection point where there is a higher risk of fuel vapor leakage, thereby removing the fuel vapor accumulated there and improving ventilation and leakage efficiency.

[0169] In addition, the second ventilation slot 41D is located on the second aluminum cover plate 4 with a relatively large wall thickness, so it can avoid deformation of the Z2 side end of each aluminum honeycomb core cell 31 of the aluminum honeycomb core layer and the wall edge turning up.

[0170] Furthermore, since the second ventilation slot 41D is located on the second aluminum cover plate 4, the manufacturing process can be simplified, similar to the above embodiments and their variations.

[0171] (Sixth Implementation Method)

[0172] The following is for reference Figure 9 The aluminum honeycomb sandwich composite panel 1E according to the sixth embodiment of the present invention will be described. For example... Figure 9 As shown, the aluminum honeycomb sandwich composite panel 1E of the sixth embodiment is formed by bonding a first aluminum cover plate 2 to the Z1 side end face of the aluminum honeycomb core layer 3 and bonding a second aluminum cover plate 4 to the Z2 side end face of the aluminum honeycomb core layer 3. For parts of the above structure that are the same as those in the above embodiments and their variations, the same markings are used and descriptions are omitted.

[0173] In this embodiment, such as Figure 9 As shown, a portion of the first ventilation groove 311E is located on the Z2 side end of the first aluminum cover plate 2 and is recessed from the Z2 side end of the first aluminum cover plate 2 towards the Z1 side. Another portion is located on the Z1 side end of each aluminum honeycomb cell 31 of the aluminum honeycomb core layer 3 and is recessed from the Z1 side end of each aluminum honeycomb cell 31 of the aluminum honeycomb core layer 3 towards the Z2 side. Thus, the first ventilation groove 311E is formed as a groove of depth H1E continuously extending across the first aluminum cover plate 2 and the Z1 side end of each aluminum honeycomb cell 31. The second ventilation groove 312E is located on the Z2 side end of each aluminum honeycomb cell 31 of the aluminum honeycomb core layer 3 and is formed as a groove of depth H2E recessed from the Z2 side end towards the Z1 side.

[0174] like Figure 9 As shown, in the XZ plane, both the first ventilation slot 311E and the second ventilation slot 312E are rectangular. This forms a third gas passage from the second ventilation slot 312E through the interior of each aluminum honeycomb cell 31 of the aluminum honeycomb core layer 3 to the first ventilation slot 311E.

[0175] In addition, such as Figure 9 As shown, in the XZ plane, the width of the first ventilation slot 311E is the same as the width of the second ventilation slot 312E, and the depth H1E of the first ventilation slot 311E is greater than the depth H2E of the second ventilation slot 312E. Therefore, the area of ​​the first ventilation slot 311E in the XZ plane is greater than the area of ​​the second ventilation slot 312E in the XZ plane. Thus, when gas flows in along a direction perpendicular to the XZ plane (i.e., the Y direction), the gas velocity passing through the first ventilation slot 311E is greater than the gas velocity passing through the second ventilation slot 312E. According to Bernoulli's principle in fluid mechanics, the greater the gas velocity, the lower the gas pressure. The gas pressure P1E on the Z1 side of each aluminum honeycomb cell 31 is less than the gas pressure P2E on the Z2 side, forming a positive pressure difference ΔPE = P2E - P1E. Under the action of this positive pressure difference ΔPE, a uniform through-flow will be formed inside each aluminum honeycomb cell 31. This not only reduces blind spots in ventilation and leakage within the aluminum honeycomb core, but also increases the airflow at the first connection point where there is a higher risk of fuel vapor leakage, thereby removing the fuel vapor accumulated there and improving ventilation and leakage efficiency.

[0176] (Seventh Implementation)

[0177] The following is for reference Figure 10 The aluminum honeycomb sandwich composite panel 1F according to the seventh embodiment of the present invention will be described below. Figure 10 As shown, the aluminum honeycomb sandwich composite panel 1F of the seventh embodiment is formed by bonding a first aluminum cover plate 2 to the Z1 side end face of the aluminum honeycomb core layer 3 and bonding a second aluminum cover plate 4 to the Z2 side end face of the aluminum honeycomb core layer 3. For parts in the above structure that are the same as those in the above embodiments and their variations, the same markings are used and descriptions are omitted.

[0178] In this embodiment, such as Figure 10 As shown, the first ventilation groove 21F is located on the Z2 side end of the first aluminum cover plate 2 and is formed as a cuboid-shaped groove with a depth H1F recessed from the Z2 side end of the second aluminum cover plate 2 towards the Z1 side. A portion of the second ventilation groove 312F is located on the Z2 side end of the aluminum honeycomb core layer 3 and is recessed from the Z2 side end of each aluminum honeycomb cell 31 towards the Z1 side, while another portion is located on the Z1 side end of the second aluminum cover plate 4 and is recessed from the Z1 side end of the second aluminum cover plate 4 towards the Z2 side. Thus, the second ventilation groove 312F is formed as a groove of depth H2F continuously formed across the Z2 side end of each aluminum honeycomb cell 31 of the aluminum honeycomb core layer 3 and the second aluminum cover plate 4.

[0179] In addition, such as Figure 10 As shown, in the XZ plane, both the first ventilation slot 21F and the second ventilation slot 312F are rectangular. This forms a third gas passage from the first ventilation slot 21F through the interior of each aluminum honeycomb cell 31 of the aluminum honeycomb core layer 3 to the second ventilation slot 312F.

[0180] Furthermore, within the XZ plane, the width of the first ventilation slot 21F is the same as the width of the second ventilation slot 312F, and the depth H1F of the first ventilation slot 21F is greater than the depth H2F of the second ventilation slot 312F. Thus, the area of ​​the first ventilation slot 21F within the XZ plane is greater than the area of ​​the second ventilation slot 312F within the XZ plane. Consequently, when gas flows in along a direction perpendicular to the XZ plane (i.e., the Y direction), the gas velocity passing through the first ventilation slot 311E is greater than the gas velocity passing through the second ventilation slot 312E. According to Bernoulli's principle in fluid mechanics, the greater the gas velocity, the lower the gas pressure. The gas pressure P1F on the Z1 side of each aluminum honeycomb cell 31 is less than the gas pressure P2F on the Z2 side, forming a positive pressure difference ΔPF = P2F - P1F. Under the action of this positive pressure difference ΔPF, a uniform through-flow will be formed inside each aluminum honeycomb cell 31. This not only reduces ventilation and leakage blind spots inside each aluminum honeycomb core 31, but also increases the ventilation airflow at the first connection point where the risk of fuel vapor leakage is high, so as to remove the fuel vapor accumulated there and improve ventilation and leakage efficiency.

[0181] In addition, the first ventilation slot 21F is located on the first aluminum cover plate 2 with a relatively large wall thickness, so it can avoid deformation of the Z1 side end of each aluminum honeycomb core cell 31 of the aluminum honeycomb core layer and the wall edge turning up.

[0182] Furthermore, since the first ventilation slot 21F is located on the first aluminum cover plate 2, the manufacturing process can be simplified, similar to the above embodiments and their variations.

[0183] (Eighth Implementation Method)

[0184] The following is for reference Figure 11 The aluminum honeycomb sandwich composite panel 1G of the eighth embodiment of the present invention will be described. For example... Figure 11 As shown, the aluminum honeycomb sandwich composite panel 1G of the eighth embodiment is formed by bonding a first aluminum cover plate 2 to the Z1 side end face of the aluminum honeycomb core layer 3 and bonding a second aluminum cover plate 4 to the Z2 side end face of the aluminum honeycomb core layer 3. For parts in the above structure that are the same as those in the above embodiments and their variations, the same markings are used and descriptions are omitted.

[0185] In this embodiment, such as Figure 11 As shown, the first ventilation groove 311G is located on the Z1 side end of the aluminum honeycomb core layer 3 and is formed as a cuboid-shaped groove with a depth H1G recessed from the Z1 side end of each aluminum honeycomb cell 31 towards the Z2 side. A portion of the second ventilation groove 312G is located on the Z2 side end of the aluminum honeycomb core layer 3 and is recessed from the Z2 side end of each aluminum honeycomb cell 31 towards the Z1 side, while another portion is located on the Z1 side end of the second aluminum cover plate 4 and is recessed from the Z1 side end of the second aluminum cover plate 4 towards the Z2 side. Thus, the second ventilation groove 312G is formed as a groove of depth H2G continuously formed across the Z2 side end of each aluminum honeycomb cell 31 of the aluminum honeycomb core layer 3 and the second aluminum cover plate 4.

[0186] In addition, such as Figure 11 As shown, in the XZ plane, both the first ventilation slot 311G and the second ventilation slot 312G are rectangular. This forms a third gas passage from the first ventilation slot 311G through the interior of each aluminum honeycomb cell 31 of the aluminum honeycomb core layer 3 to the second ventilation slot 312G.

[0187] In addition, such as Figure 11As shown, in the XZ plane, the width of the first ventilation slot 311G is the same as the width of the second ventilation slot 312G, and the depth H1G of the first ventilation slot 311G is greater than the depth H2G of the second ventilation slot 312G. Thus, the cross-sectional area of ​​the first ventilation slot 311G in the XZ plane is greater than that of the second ventilation slot 312G in the XZ plane. Therefore, when gas flows in along a direction perpendicular to the XZ plane (i.e., the Y direction), the gas velocity passing through the first ventilation slot 311G is greater than that passing through the second ventilation slot 312G. According to Bernoulli's principle in fluid mechanics, the greater the gas velocity, the lower the gas pressure. The gas pressure P1G on the Z1 side of each aluminum honeycomb cell 31 is less than the gas pressure P2G on the Z2 side, forming a positive pressure difference ΔPG = P2G - P1G. Under the action of this positive pressure difference ΔPG, a uniform through-flow will be formed inside each aluminum honeycomb cell 31. This not only reduces ventilation and leakage blind spots inside each aluminum honeycomb core 31, but also increases the ventilation airflow at the first connection point where the risk of fuel vapor leakage is high, so as to remove the fuel vapor accumulated there and improve ventilation and leakage efficiency.

[0188] (Ninth Implementation)

[0189] The following is for reference Figure 12 The aluminum honeycomb sandwich composite panel 1H according to the ninth embodiment of the present invention will be described. For example... Figure 12 As shown, the aluminum honeycomb sandwich composite panel 1H of the ninth embodiment is formed by bonding a first aluminum cover plate 2 to the Z1 side end face of the aluminum honeycomb core layer 3 and bonding a second aluminum cover plate 4 to the Z2 side end face of the aluminum honeycomb core layer 3. For parts in the above structure that are the same as those in the above embodiments and their variations, the same markings are used and descriptions are omitted.

[0190] In this embodiment, such as Figure 12 As shown, a portion of the first ventilation groove 21H is located on the Z2 side end of the first aluminum cover plate 2 and is recessed from the Z2 side end of the first aluminum cover plate 2 towards the Z1 side, while another portion is located on the Z1 side end of each aluminum honeycomb cell 31 and is recessed from the Z1 side end of each aluminum honeycomb cell 31 towards the Z2 side. Thus, the first ventilation groove 21H is formed as a groove of depth H1H that continuously spans the Z1 side ends of each aluminum honeycomb cell 31 of the first aluminum cover plate 2 and the aluminum honeycomb core layer 3. Correspondingly, a portion of the second ventilation groove 312H is located on the Z2 side end of each aluminum honeycomb cell 31 of the aluminum honeycomb core layer 3 and is recessed from the Z2 side end of each aluminum honeycomb cell 31 towards the Z1 side, while another portion is located on the Z1 side end of the second aluminum cover plate 4 and is recessed from the Z1 side end of the second aluminum cover plate 4 towards the Z2 side. Thus, the second ventilation slot 312H is formed as a groove of depth H2H that is continuously formed across the Z2 side end of each aluminum honeycomb cell 31 of the aluminum honeycomb core layer 3 and the second aluminum cover plate 4.

[0191] In addition, such as Figure 12 As shown, in the XZ plane, both the first ventilation slot 21H and the second ventilation slot 312H are rectangular. This forms a third gas passage from the second ventilation slot 312H through the interior of each aluminum honeycomb cell 31 of the aluminum honeycomb core layer 3 to the first ventilation slot 21H.

[0192] Furthermore, within the XZ plane, the width of the first ventilation slot 21H is the same as the width of the second ventilation slot 312H, and the depth H1H of the first ventilation slot 21H is greater than the depth H2H of the second ventilation slot 312H. Thus, the area of ​​the first ventilation slot 21H is greater than the area of ​​the second ventilation slot 312H. Consequently, when gas flows in along a direction perpendicular to the XZ plane (i.e., the Y direction), the gas velocity passing through the first ventilation slot 21H is greater than the gas velocity passing through the second ventilation slot 312H. According to Bernoulli's principle in fluid mechanics, the greater the gas velocity, the lower the gas pressure. The gas pressure P1H on the Z1 side of each aluminum honeycomb cell 31 is less than the gas pressure P2H on the Z2 side, forming a positive pressure difference ΔPH = P2H - P1H. Under the action of this positive pressure difference ΔPH, a uniform through-flow will be formed inside each aluminum honeycomb cell 31. This not only reduces ventilation and leakage blind spots inside each aluminum honeycomb core 31, but also increases the ventilation airflow at the first connection point where the risk of fuel vapor leakage is high, so as to remove the fuel vapor accumulated there and improve ventilation and leakage efficiency.

[0193] In order to make the objectives, technical solutions and advantages of the various embodiments of the present invention clearer, the following descriptions are provided in conjunction with the embodiments of the present invention. Figure 1-13 The technical solutions of various embodiments and modifications of the present invention have been clearly and completely described. Obviously, the described embodiments and modifications are only some, not all, of the embodiments of the present invention. Based on the above embodiments, those skilled in the art can combine the elements of the above embodiments to obtain the technical solutions of the present invention without departing from the spirit of the present invention and without creative effort.

[0194] In the above embodiments and their variations, the first aluminum cover plate and the second aluminum cover plate are formed into a cuboid shape, but the present invention is not limited to this and can also be formed into other shapes.

[0195] In the above embodiments and their variations, the first aluminum cover plate and the second aluminum cover plate have the same shape, but the present invention is not limited to this. As long as they can cover all the ventilation slots, they can also have different shapes.

[0196] In the above embodiments and their variations, all ventilation slots formed at the connection portion on the Z1 side and arranged side-by-side in the X direction are designated as first ventilation slots, and all ventilation slots formed at the connection portion on the Z2 side and arranged side-by-side in the X direction are designated as second ventilation slots. However, the present invention is not limited to this. It is also possible to designate some ventilation slots formed at the connection portion on the Z1 side and arranged side-by-side in the X direction as first ventilation slots, and designate the ventilation slots formed at the connection portion on the Z2 side and arranged side-by-side in the X direction as second ventilation slots. At the same time, the remaining ventilation slots formed at the connection portion on the Z1 side and arranged side-by-side in the X direction are designated as second ventilation slots, and the ventilation slots formed at the connection portion on the Z2 side and arranged side-by-side in the X direction as first ventilation slots, so that the cross-sectional area of ​​the first ventilation slot in the XZ plane is greater than the cross-sectional area of ​​the second ventilation slot in the XZ plane.

[0197] In the above embodiments and their variations, the cross-sectional shape of the first ventilation slot and the second ventilation slot in the XZ plane is U-shaped or rectangular, but the present invention is not limited to this and may also be other shapes.

[0198] In the above embodiments and their variations, the cross-sectional shape of the first ventilation slot and the second ventilation slot in the XY plane is rectangular or star-shaped. However, the present invention is not limited to this. As long as it can penetrate the aluminum honeycomb sandwich composite panel along the airflow direction (i.e., the Y direction), it can also be formed into other shapes.

[0199] In the above embodiments and their variations, adhesive bonding is listed as a method for connecting the first aluminum cover plate and the second aluminum cover plate to the aluminum honeycomb core layer. However, the present invention is not limited to this and other methods may also be used.

Claims

1. An aluminum honeycomb sandwich composite panel, wherein a gas passage for airflow is formed inside, comprising: An aluminum honeycomb core layer, wherein the aluminum honeycomb core layer is composed of multiple hollow aluminum honeycomb cells arranged in a grid; A first aluminum cover plate, the first aluminum cover plate being connected to one end face of the aluminum honeycomb core layer along its axial direction, and forming a first connection portion; and A second aluminum cover plate is connected to the other end face of the aluminum honeycomb core layer along its axial direction, forming a second connection portion. Its features are, The first connecting portion includes a first ventilation slot. The second connection portion includes a second ventilation slot. The first ventilation slot and the second ventilation slot each form the gas passage. The first ventilation slot and the second ventilation slot have different cross-sectional areas perpendicular to the airflow direction, so that the flow resistance of the gas passing through them is different, thereby creating a flow velocity difference between the gas passage where the first ventilation slot is located and the gas passage where the second ventilation slot is located.

2. The aluminum honeycomb sandwich composite panel as described in claim 1, characterized in that, The width of the first ventilation slot in the cross-section perpendicular to the airflow direction is the same as the width of the second ventilation slot in the cross-section perpendicular to the airflow direction. The depth of the first ventilation channel in the cross-section perpendicular to the airflow direction is greater than the depth of the second ventilation channel in the cross-section perpendicular to the airflow direction.

3. The aluminum honeycomb sandwich composite panel as described in claim 2, characterized in that, The first ventilation slot at the first connection point is located on the first aluminum cover plate. The second ventilation slot of the second connection part is located on the second aluminum cover plate.

4. The aluminum honeycomb sandwich composite panel as described in claim 2, characterized in that, The first ventilation slot at the first connection point is located on the first aluminum cover plate. The second ventilation slot of the second connection part is located on the end of each aluminum honeycomb cell of the aluminum honeycomb core layer near the second aluminum cover plate.

5. The aluminum honeycomb sandwich composite panel as described in claim 2, characterized in that, The first ventilation slot at the first connection point is located at the end of each aluminum honeycomb cell in the aluminum honeycomb core layer near the first aluminum cover plate. The second ventilation slot of the second connection part is located on the end of each aluminum honeycomb cell of the aluminum honeycomb core layer near the second aluminum cover plate.

6. The aluminum honeycomb sandwich composite panel as described in claim 2, characterized in that, The first ventilation slot at the first connection point is located at the end of each aluminum honeycomb cell in the aluminum honeycomb core layer near the first aluminum cover plate. The second ventilation slot of the two connecting parts is located on the second aluminum cover plate.

7. The aluminum honeycomb sandwich composite panel as described in claim 2, characterized in that, The first ventilation slot at the first connection portion is formed continuously across the first aluminum cover plate and the ends of each aluminum honeycomb core cell of the aluminum honeycomb core layer near the first aluminum cover plate. The second ventilation slot of the second connection part is located on the second aluminum cover plate.

8. The aluminum honeycomb sandwich composite panel as described in claim 2, characterized in that, The first ventilation slot at the first connection portion is formed continuously across the first aluminum cover plate and the ends of each aluminum honeycomb core cell of the aluminum honeycomb core layer near the first aluminum cover plate. The second ventilation slot of the second connection part is located on the end of each aluminum honeycomb cell of the aluminum honeycomb core layer near the second aluminum cover plate.

9. The aluminum honeycomb sandwich composite panel as described in claim 2, characterized in that, The first ventilation slot at the first connection point is located on the first aluminum cover plate. The second ventilation slot of the second connection portion is formed continuously across the ends of each of the aluminum honeycomb core cells of the aluminum honeycomb core layer near the second aluminum cover plate and the second aluminum cover plate.

10. The aluminum honeycomb sandwich composite panel as described in claim 2, characterized in that, The first ventilation slot at the first connection point is located at the end of each aluminum honeycomb cell in the aluminum honeycomb core layer near the first aluminum cover plate. The second ventilation slot of the second connection portion is formed continuously across the ends of each of the aluminum honeycomb core cells of the aluminum honeycomb core layer near the second aluminum cover plate and the second aluminum cover plate.

11. The aluminum honeycomb sandwich composite panel as described in claim 2, characterized in that, The first ventilation slot at the first connection portion is formed continuously across the first aluminum cover plate and the ends of each aluminum honeycomb core cell of the aluminum honeycomb core layer near the first aluminum cover plate. The second ventilation slot of the second connection portion is formed continuously across the ends of each of the aluminum honeycomb core cells of the aluminum honeycomb core layer near the second aluminum cover plate and the second aluminum cover plate.

12. The aluminum honeycomb sandwich composite panel as described in any one of claims 1 to 11, characterized in that, The wall thickness of the first aluminum cover plate and the second aluminum cover plate is greater than the wall thickness of each aluminum honeycomb cell in the aluminum honeycomb core layer.

13. The aluminum honeycomb sandwich composite panel as described in any one of claims 1 to 11, characterized in that, It also includes air intake and exhaust ports. The gas passage is formed between the air inlet and the exhaust outlet.

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