Large-size rotary cylinder and preparation method thereof

Abstract

This invention discloses a large-size rotary cylinder and its manufacturing method. The large-size rotary cylinder includes an outer wall and an inner wall with an airfoil cross-section cylindrical structure. Two sets of corresponding ends of the outer and inner walls are connected. The outer wall has a fixed base connection point, and the inner wall has a flow guide arm connection point. A portion of the outer wall corresponding to the fixed base connection point is a solid composite material wall, while the remaining areas are partially or entirely sandwich structures with a composite material skin covering a foam core. Similarly, a portion of the inner wall corresponding to the flow guide arm connection point is a solid composite material wall, while the remaining areas are partially or entirely sandwich structures with a composite material skin covering a foam core. This invention is applied to the field of composite material cylinder molding technology, enabling the cylinder to have high structural strength and resistance to axial deformation. It requires no auxiliary support devices except for a fixed base support at the bottom, greatly saving space and reducing assembly difficulty.

Description

Technical Field

[0001] This invention relates to the field of composite material cylinder molding technology, specifically a large-size airfoil section rotary cylinder and its preparation method. Background Technology

[0002] The ducting system of a hovercraft typically consists of a fixed base, a cylindrical body, guide arms, and a fairing. The cylindrical body, with an airfoil cross-section, is mounted on the fixed base, while the fairing is housed within the cylindrical body via the guide arms. Previously, ducting systems typically included additional support structures besides the fixed base supporting its bottom to prevent axial movement or deformation during operation. However, these additional support structures not only require significant space but also involve complex assembly processes and high costs. Therefore, there is an urgent need for a large-size rotating cylindrical body that can achieve sufficient strength solely through fixed base support. Summary of the Invention

[0003] To address the shortcomings of the existing technology, this invention provides a large-size rotary cylinder and its manufacturing method, which has high structural strength and resistance to axial deformation. It requires no other auxiliary support devices except for a fixed base at the bottom, thus greatly saving space and reducing assembly difficulty.

[0004] To achieve the above objectives, the present invention provides a large-size rotary cylinder, comprising an outer wall and an inner wall with an airfoil cross-section cylindrical structure, wherein two sets of corresponding ends of the outer wall and the inner wall are connected, the outer wall has a fixed base connection, and the inner wall has a flow guide arm connection.

[0005] The outer wall has a portion of the area corresponding to the connection of the fixed base as a solid composite material wall, while the remaining areas have a sandwich structure of composite material skin covering foam core material in part or all.

[0006] The inner wall has a portion of solid composite material wall corresponding to the connection of the flow guide arm, while the remaining areas have a sandwich structure of composite material skin covering foam core material in part or all.

[0007] In one embodiment, the outer wall includes a first composite material skin on the surface and a first foam core material on the inner layer. The first foam core material has a first hollowed-out at the position corresponding to the connection of the fixed base, and the first hollowed-out is filled with a first composite material reinforcing layer.

[0008] The inner wall includes a second composite material skin on the surface and a second foam core material on the inner surface. The second foam core material has a second hollowed-out part at the position corresponding to the connection of the flow guide arm, and the second hollowed-out part is filled with a second composite material reinforcing layer.

[0009] In one embodiment, the second perforation cuts off the second foam core material, i.e., the second composite material reinforcement layer covers the entire longitudinal direction of the inner wall.

[0010] In one embodiment, there are a plurality of circumferential ribs and a plurality of longitudinal ribs between the inner wall and the outer wall;

[0011] One end of the circumferential rib and the longitudinal rib is connected to the inner surface of the outer wall, and the other end of the circumferential rib and the longitudinal rib is connected to the inner surface of the inner wall.

[0012] In one embodiment, the portion of the outer wall corresponding to the longitudinal rib is a solid composite material wall; and / or

[0013] The portion of the inner wall corresponding to the longitudinal rib is a solid composite material wall.

[0014] In one embodiment, the portion of the outer wall corresponding to the circumferential rib is a solid composite material wall; and / or

[0015] The portion of the inner wall corresponding to the circumferential rib is a solid composite material wall.

[0016] To achieve the above objectives, the present invention also provides a method for preparing the above-mentioned large-size rotary cylinder, comprising the following steps:

[0017] The outer wall and the inner wall are respectively segmented and shaped to obtain a plurality of segmented inner walls and segmented outer walls, including:

[0018] First, lay the outer layer of composite material reinforcement / prepreg on the inner wall of the segment and the outer surface of the outer wall of the segment;

[0019] Lay the foam core material on the outer composite reinforcement layer / prepreg and reserve the corresponding hollow area of ​​the solid composite wall, and then lay the middle composite reinforcement layer / prepreg of the solid composite wall in the hollow area; or first lay the middle composite reinforcement layer / prepreg of the solid composite wall on the outer composite reinforcement layer / prepreg, and then lay the foam core material.

[0020] After laying the inner composite material reinforcement layer / prepreg on the upper surface of the foam core material and the middle layer composite material reinforcement layer / prepreg, the inner wall and outer wall of the segment are cured and formed by vacuum bag pressing process.

[0021] Finally, the inner and outer walls of the segments are assembled according to the preset positions, thus completing the preparation of the large-size rotary cylinder.

[0022] Compared with the prior art, the present invention has the following beneficial technical effects:

[0023] This invention sets a portion of the outer and inner walls at the connection points with the fixed base and the connection points with the guide arm as solid composite material walls, while maintaining a large area of ​​the main structure of the outer and inner walls using composite material skin / foam sandwich structure. This reduces weight as much as possible while greatly enhancing the rigidity and strength of the cylinder. As a result, the cylinder does not require any other auxiliary support devices except for the fixed base support at the bottom, which greatly saves space and reduces assembly difficulty. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the catheter device in an embodiment of the present invention;

[0026] Figure 2 This is a partial cross-sectional view of the outer wall in an embodiment of the present invention;

[0027] Figure 3 This is a partial cross-sectional view of the inner wall in an embodiment of the present invention.

[0028] Reference numerals: cylinder 1, outer wall 101, first composite material skin 1011, first foam core material 1012, first composite material reinforcing layer 1013, inner wall 102, second composite material skin 1021, second foam core material 1022, second composite material reinforcing layer 1023, fixed base 2, flow guide arm 3, flow guide cover 4.

[0029] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0032] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixation," etc., should be interpreted broadly. For example, "fixation" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an adhesive connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0035] Example 1

[0036] This embodiment discloses a large-size rotating cylinder (hereinafter referred to as "cylinder"), which is mainly used as the cylinder for the ductwork device on a hovercraft. Reference Figure 1 The conduit device consists of a cylindrical body 1, a fixed base 2, flow guide arms 3, and a flow guide shroud 4. The cylindrical body 1 is mounted on the fixed base 2, and the flow guide shroud 4 is mounted inside the cylindrical body 1 via the flow guide arms 3. The cylindrical body 1 includes an outer wall 101 and an inner wall 102 with an airfoil cross-section. The two corresponding ends of the outer wall 101 and the inner wall 102 are connected. Therefore, the outer wall 101 has a fixed base connection point for connecting to the fixed base 2, and the inner wall 102 has flow guide arm connection points for connecting each flow guide arm 3.

[0037] In this embodiment, a portion of the outer wall 101 corresponding to the connection with the fixed base is a solid composite material wall, while the remaining areas are partially or entirely sandwich structures with a composite material skin covering a foam core. Similarly, a portion of the inner wall 102 corresponding to the connection with the flow guide arm is a solid composite material wall, while the remaining areas are partially or entirely sandwich structures with a composite material skin covering a foam core. By setting the portions of the outer wall 101 and inner wall 102 corresponding to the connection with the fixed base and flow guide arm as solid composite material walls, while maintaining a large area of ​​the main structure of the outer wall 101 and inner wall 102 using a composite material skin / foam sandwich structure, the rigidity and strength of the cylinder 1 are greatly enhanced while minimizing weight. This allows the cylinder 1 to function without additional auxiliary support devices besides the fixed base 2 at the bottom, significantly saving space and reducing assembly difficulty.

[0038] refer to Figure 2 , Figure 3 The outer wall 101 includes a first composite material skin 1011 on the surface and a first foam core material 1012 on the inner surface. The inner wall 102 includes a second composite material skin 1021 on the surface and a second foam core material 1022 on the inner surface. The first foam core material 1012 has a first hollowed-out at the position corresponding to the connection with the fixed base, and the first hollowed-out is filled with a first composite material reinforcing layer 1013. The second foam core material 1022 has a second hollowed-out at the position corresponding to the connection with the guide arm, and the second hollowed-out is filled with a second composite material reinforcing layer 1023.

[0039] Considering that the flow guide arm 3 is flat and connected to the inner wall 102 along the longitudinal direction of the cylinder 1, this embodiment is preferably designed so that the second hollow cuts off the second foam core material 1022, so that the second composite material reinforcing layer 1023 covers the entire longitudinal direction of the inner wall 102, further enhancing the rigidity and strength of the cylinder 1.

[0040] In the specific implementation process, several circumferential ribs and several longitudinal ribs are also provided between the inner wall 102 and the outer wall 101. One end of the circumferential ribs and longitudinal ribs is connected to the inner wall 102 surface of the outer wall 101, and the other end of the circumferential ribs and longitudinal ribs is connected to the inner wall 102 surface of the inner wall 102. Specifically, the longitudinal ribs are distributed at equal intervals along the circumference of the cylinder 1 between the outer wall 101 and the inner wall 102. Several arc-shaped circumferential ribs are installed at intervals along the axial direction of the cylinder 1 between two adjacent longitudinal ribs. All the circumferential ribs form a multi-layered ring beam between the outer wall 101 and the inner wall 102.

[0041] In practical applications, if the weight constraint of the cylinder 1 is low, a portion of the outer wall 101 corresponding to the longitudinal ribs can be made of solid composite material, and / or a portion of the inner wall 102 corresponding to the longitudinal ribs can be made of solid composite material. Alternatively, a portion of the outer wall 101 corresponding to the circumferential ribs can be made of solid composite material, and / or a portion of the inner wall 102 corresponding to the circumferential ribs can be made of solid composite material.

[0042] Example 2

[0043] This embodiment discloses a method for preparing a large-size rotary cylinder, which mainly includes the following steps:

[0044] The outer wall and inner wall are separately segmented and shaped to obtain several segmented outer walls and segmented inner walls, including:

[0045] First, lay the outer layer of composite material reinforcement / prepreg on the outer surface of the segmented outer wall and the inner surface of the segmented inner wall;

[0046] Lay the foam core material on the outer composite reinforcement layer / prepreg and reserve the corresponding hollow area of ​​the solid composite wall, and then lay the middle composite reinforcement layer / prepreg of the solid composite wall in the hollow area; or first lay the middle composite reinforcement layer / prepreg of the solid composite wall on the outer composite reinforcement layer / prepreg, and then lay the foam core material.

[0047] After laying the inner composite material reinforcement layer / prepreg on the upper surface of the foam core material and the middle layer composite material reinforcement layer / prepreg, the outer wall and inner wall of the segment are cured and formed by vacuum bag pressing process.

[0048] Finally, the inner and outer walls of the segments are assembled according to the preset positions, thus completing the preparation of the large-size rotary cylinder.

[0049] In the specific implementation process, if the cylinder includes circumferential ribs and longitudinal ribs, the preferred method for assembling the segmented inner wall and segmented outer wall is as follows:

[0050] First, fix each circumferential rib and longitudinal rib to the inner surface of each segment's inner wall according to the preset position;

[0051] Then, the inner walls of each segment are fixedly connected according to the preset position to form an annular integral inner wall with circumferential ribs and longitudinal ribs;

[0052] Finally, according to the preset positions, the outer walls of each segment are connected to the inner wall of the ring to complete the assembly of the large-size rotary cylinder.

[0053] During the specific process of forming the inner walls of each segment, skirts extending towards the inner surface of the inner wall are simultaneously formed on the left and right sides of each segment. Therefore, when fixing the inner walls of each segment according to the preset positions, the inner walls with circumferential and longitudinal ribs are first placed according to the preset positions, so that the two skirts on adjacent sides of adjacent inner walls overlap, and then bolts are used to connect and fix the two skirts on adjacent sides. This process not only eliminates the need to form a groove structure on the inner walls of the segments, making the forming process more convenient, but also ensures that when fixing the two skirts on adjacent sides with bolts, both skirts face outwards without external wall obstruction, facilitating construction operations. This not only does not affect the overall strength of the large-size rotating cylinder, but also improves construction efficiency and reduces construction costs.

[0054] The above description is only a preferred embodiment of the present invention and does not limit the scope of protection of the present invention. All equivalent structural transformations made under the inventive concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.

Claims

1. A large-size rotary cylinder, characterized in that, It includes an outer wall and an inner wall of an airfoil cross-section cylindrical structure, with two sets of corresponding ends of the outer wall and the inner wall connected. The outer wall has a fixed base connection, and the inner wall has a flow guide arm connection. The outer wall has a portion of solid composite material wall corresponding to the connection of the fixed base, and the remaining areas are partially or entirely sandwich structures with composite material skin covering foam core material; the inner wall has a portion of solid composite material wall corresponding to the connection of the guide arm, and the remaining areas are partially or entirely sandwich structures with composite material skin covering foam core material. The outer wall comprises a first composite material skin on the surface and a first foam core material on the inner layer. The first foam core material has a first hollow corresponding to the connection of the fixed base, and the first hollow is filled with a first composite material reinforcing layer. The inner wall comprises a second composite material skin on the surface and a second foam core material on the inner layer. The second foam core material has a second hollow corresponding to the connection of the flow guide arm, and the second hollow is filled with a second composite material reinforcing layer. The outer and inner walls of the cylinder are made of solid composite material at the connection points with the fixed base and the connection points with the guide arm. At the same time, the main structure of the outer and inner walls is made of composite material skin / foam sandwich structure. While reducing weight as much as possible, the rigidity and strength of the cylinder are greatly enhanced. This means that the cylinder does not need any other auxiliary support devices except for the fixed base support at the bottom, saving space and reducing assembly difficulty.

2. The large-size rotary cylinder according to claim 1, characterized in that, The second perforation cuts off the second foam core material, that is, the second composite material reinforcement layer covers the entire longitudinal direction of the inner wall.

3. The large-size rotary cylinder according to claim 1 or 2, characterized in that, Between the inner wall and the outer wall are several circumferential ribs and several longitudinal ribs; One end of the circumferential rib and the longitudinal rib is connected to the inner surface of the outer wall, and the other end of the circumferential rib and the longitudinal rib is connected to the inner surface of the inner wall.

4. The large-size rotary cylinder according to claim 3, characterized in that, The portion of the outer wall corresponding to the longitudinal rib is a solid composite material wall; and / or the portion of the inner wall corresponding to the longitudinal rib is a solid composite material wall.

5. The large-size rotary cylinder according to claim 3, characterized in that, The portion of the outer wall corresponding to the circumferential rib is a solid composite material wall; and / or the portion of the inner wall corresponding to the circumferential rib is a solid composite material wall.

6. A method for preparing a large-size rotary cylinder according to any one of claims 1 to 5, characterized in that, Includes the following steps: The outer wall and the inner wall are respectively segmented and shaped to obtain a plurality of segmented inner walls and segmented outer walls, including: First, lay the outer layer of composite material reinforcement / prepreg on the inner wall of the segment and the outer surface of the outer wall of the segment; Lay the foam core material on the outer composite reinforcement layer / prepreg and reserve the corresponding hollow area of ​​the solid composite wall, and then lay the middle composite reinforcement layer / prepreg of the solid composite wall in the hollow area; or first lay the middle composite reinforcement layer / prepreg of the solid composite wall on the outer composite reinforcement layer / prepreg, and then lay the foam core material. After laying the inner composite material reinforcement layer / prepreg on the upper surface of the foam core material and the middle layer composite material reinforcement layer / prepreg, the inner wall and outer wall of the segment are cured and formed by vacuum bag pressing process. Finally, the inner and outer walls of the segments are assembled according to the preset positions, thus completing the preparation of the large-size rotary cylinder.

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