Large-size rotary cylinder

Abstract

The invention discloses a large-size rotary cylinder which comprises an outer wall and an inner wall of a cylindrical structure with a wing-shaped section, and two groups of corresponding ends of the outer wall and the inner wall are connected; the outer wall is defined by sequentially connecting a plurality of outer wall sections, the inner wall is defined by sequentially connecting a plurality of inner wall sections, and the outer wall sections and the inner wall sections are both of a sandwich structure formed by wrapping a foam core material with composite skin; and a first parting surface between the two outer wall sections and a second parting surface between the two inner wall sections are staggered from each other. The composite material barrel is applied to the field of composite material barrels, so that the barrel has higher structural strength and axial deformation resistance, other auxiliary supporting devices are not needed except that the bottom of the barrel needs to be supported by a fixed base, the occupied space is greatly saved, and the assembly difficulty is reduced.

Description

Technical Field

[0001] This invention relates to the field of composite material cylinder technology, specifically a large-size rotary cylinder. Background Technology

[0002] The ducting device is a crucial structural component of the hovercraft's propulsion system and a key part of the overall power system, providing power for the hull's movement. The ducting device typically consists of a cylinder, support arms, a central support, and a base. The cylinder is the main structure, a rotating structure, and is enormous. The thrust generated by the air propeller is transmitted to the hull through the central support, support arms, cylinder, and base. Simultaneously, the auxiliary thrust generated by the aerodynamic cross-section of the cylinder in the flow field is also transmitted to the hull through the cylinder-base path, jointly propelling the hovercraft. This places high demands on the structural rigidity of the composite material components such as the cylinder, support arms, and base, as well as the overall structure of the cylinder.

[0003] In the past, in addition to the base supporting its bottom, the cylindrical body of conduit devices typically had other supporting structures to prevent axial movement or deformation during use. However, these additional supporting structures not only occupy a large amount of 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 base support. Summary of the Invention

[0004] To address the shortcomings of the existing technology, this invention provides a large-size rotary cylinder with high structural strength and resistance to axial deformation. This eliminates the need for auxiliary support devices other than a fixed base at the bottom, significantly saving space and reducing assembly difficulty.

[0005] To achieve the above objectives, the present invention provides a large-size rotating cylinder, comprising an outer wall and an inner wall of 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 is formed by multiple outer wall segments connected in sequence, and the inner wall is formed by multiple inner wall segments connected in sequence. Both the outer wall segments and the inner wall segments are sandwich structures with composite material skin covering foam core material. The first parting surface between the two outer wall segments and the second parting surface between the two inner wall segments are offset from each other.

[0006] In one embodiment, the large-size rotary cylinder further includes multiple sets of circumferential reinforcing mechanisms, each of which is disposed between the inner wall and the outer wall and is spaced apart along the axial direction; The circumferential reinforcing mechanism includes a plurality of circumferential reinforcing ribs distributed at intervals along the circumferential direction, and all the second parting surfaces are provided with the circumferential reinforcing ribs.

[0007] In one embodiment, the circumferential reinforcing ribs are provided across part or all of the first parting surface.

[0008] In one embodiment, each of the inner wall segments has an inwardly flanged flange extending toward the inner surface of the inner wall segment on both the left and right sides. The two inner flanges on adjacent sides of the two adjacent inner wall segments are fixedly connected by bolts.

[0009] In one embodiment, an inner wall recessed structure is provided on the outer side of the inner wall corresponding to the second parting surface, and the inner wall recessed structure is filled with an inner wall outer surface reinforcement layer.

[0010] In one embodiment, an outer wall recessed structure is provided on the outer side of the outer wall corresponding to the first parting surface, and the outer wall recessed structure is filled with an outer wall outer surface reinforcement layer.

[0011] In one embodiment, the number of inner wall lobes is less than the number of outer wall lobes.

[0012] Compared with the prior art, the present invention has the following beneficial technical effects: 1. This invention ensures the continuity of the composite material skin fiber reinforcement between the inner wall and outer wall by staggering the first parting surface between the outer wall segments and the second parting surface between the inner wall segments, thereby enhancing the rigidity and strength of the cylinder. This allows the cylinder to be supported by the base at the bottom without any other auxiliary support devices, greatly saving space and reducing assembly difficulty. 2. In the preferred embodiment of the present invention, by setting circumferential reinforcing ribs and making the circumferential reinforcing ribs span all of the second parting surface and part or all of the first parting surface, the continuity of the overall cylinder structure is greatly enhanced, thereby further strengthening the rigidity and strength of the cylinder and improving its resistance to axial deformation. 3. In a preferred embodiment of the present invention, by setting an inner wall sinking structure and an outer wall sinking structure on the inner wall and the outer wall respectively, and filling the outer surface of the inner wall with a reinforcing layer and the outer surface of the outer wall with a reinforcing layer respectively, the rigidity and strength of the cylinder are further enhanced, and its service life is improved.

[0013] The first parting surface between the two outer wall segments and the second parting surface between the two inner wall segments are offset from each other. Attached Figure Description 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.

[0014] Figure 1 This is a schematic cross-sectional view of the cylinder in an embodiment of the present invention; Figure 2 This is a partial cross-sectional schematic diagram of the inner wall in an embodiment of the present invention.

[0015] Reference numerals: 1. Outer wall segment; 2. Inner wall segment; 201. Inner flange; 202. Inner wall outer surface reinforcement layer; 3. First parting surface; 4. Second parting surface; 5. Bolt.

[0016] 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

[0017] 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.

[0018] 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.

[0019] 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.

[0020] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, 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.

[0021] 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.

[0022] This embodiment discloses a large-size rotating cylinder (hereinafter referred to as "cylinder"), which is mainly used as the cylinder for the duct device on a hovercraft. Specifically, the cylinder includes an outer wall and an inner wall with an airfoil cross-section cylindrical structure, and two sets of corresponding ends of the outer wall and the inner wall are connected. Since both the outer wall and the inner wall are rotating structures and are huge in size, it is difficult to achieve integral molding and assembly of the outer wall and the inner wall. Therefore, in this embodiment, the outer wall is formed by multiple outer wall segments 1 connected in sequence, and the inner wall is formed by multiple inner wall segments 2 connected in sequence. Both the outer wall segments 1 and the inner wall segments 2 are "sandwich" structures with composite material skin covering PMI foam core material, thereby significantly reducing the weight of the cylinder while ensuring the overall structural strength of the cylinder.

[0023] In fiber-reinforced polymer matrix composites, fibers form the primary load-bearing skeleton. To meet the stringent challenges of large-diameter structural conduit devices, it is essential to maintain the continuity of fiber reinforcement as much as possible; however, segmented designs of the outer and inner walls are unavoidable. Therefore, in this embodiment, the first parting surface 3 between the outer wall segments 1 and the second parting surface 4 between the inner wall segments 2 are staggered, i.e. Figure 1 As shown, this ensures the continuity of the composite material skin fiber reinforcement between the inner and outer walls of the cylinder, enhancing the rigidity and strength of the cylinder. This eliminates the need for auxiliary support devices other than the base support at the bottom, significantly saving space and reducing assembly difficulty. Specifically, the first parting surface 3 is the connecting and mating surface between two adjacent outer wall segments 1, and the second parting surface 4 is the connecting and mating surface between two adjacent inner wall segments 2.

[0024] Conventional cylindrical bodies typically have circumferential and longitudinal reinforcing mechanisms between their outer and inner walls. The longitudinal reinforcing mechanism includes multiple longitudinal reinforcing ribs spaced circumferentially, with their inner and outer sides bonded to the inner and outer walls, respectively. The circumferential reinforcing mechanisms are usually multiple and spaced along the axial direction of the cylindrical body. Each circumferential reinforcing mechanism includes several circumferential reinforcing ribs spaced circumferentially, with their inner and outer sides bonded to the inner and outer walls, respectively. Previously, the inner sides of the circumferential reinforcing ribs on the cylindrical body were integrally bonded to a single inner wall segment 2, meaning there were no circumferential reinforcing ribs at the position corresponding to the second parting surface 4. Therefore, in this embodiment, a circumferential reinforcing rib is preferably provided across each second parting surface 4, meaning a circumferential reinforcing rib is provided at the position corresponding to the second parting surface 4, and the inner side of this circumferential reinforcing rib is simultaneously bonded to two inner wall segments 2. More preferably, circumferential reinforcing ribs are provided across part or all of the first parting surface 3, so that the segmented circumferential reinforcing ribs cross all the second parting surfaces 4 and most of the first parting surfaces 3, which greatly enhances the continuity of the guide tube structure, thereby further strengthening the rigidity and strength of the tube and improving its resistance to axial deformation.

[0025] In a preferred embodiment, each inner wall segment 2 has an inner flange 201 extending towards the inner surface of the inner wall segment 2 on both its left and right sides. Two adjacent inner flanges 201 on adjacent inner wall segments 2 are fixedly connected by bolts 5. During cylinder assembly, each inner wall segment 2 is first placed according to a preset position, so that the two adjacent inner flanges 201 on adjacent inner wall segments 2 overlap. Then, the two adjacent inner flanges 201 are connected and fixed using bolts 5. Next, longitudinal and circumferential reinforcing ribs are bonded to the assembled inner wall, and finally, the outer wall segment 1 is bonded. This process eliminates the need to form a groove structure on the inner wall segment 2, making the forming process of the inner wall segment more convenient. Furthermore, when fixing the two adjacent inner flanges 201 with bolts 5, neither inner flange 201 is obstructed by an outer wall, making construction easier. This not only does not affect the overall strength of the large-size rotating cylinder but also improves construction efficiency and reduces construction costs.

[0026] In a preferred embodiment, an inner wall recessed structure is provided on the outer side of the inner wall corresponding to the second parting surface 4, and the inner wall recessed structure is filled with an inner wall outer surface reinforcement layer 202, for example... Figure 2 As shown, an outer wall recessed structure is provided on the outer side of the outer wall corresponding to the first parting surface 3, and the outer wall recessed structure is filled with an outer wall outer surface reinforcement layer. Both the inner wall outer surface reinforcement layer 202 and the outer wall outer surface reinforcement layer are composite material filling layers, which not only cover the first parting surface 3 and the second parting surface 4 to ensure the smoothness of the cylinder surface, but also further enhance the rigidity and strength of the cylinder, improving its service life.

[0027] Considering that the cylinder in this embodiment is used as a guide tube, and the inner wall of the guide tube has a paddle disk area, which requires higher structural strength and rigidity, in this embodiment, when dividing the outer wall and inner wall into segments 2, the number of inner wall segments 2 is controlled to be less than that of outer wall segments 1, that is, the number of inner wall segments 2 is minimized, for example, only 2 or 3 inner wall segments 2 are set, so as to maximize the preservation of the fiber reinforcement continuity of the inner wall paddle disk area, while the outer wall can be adaptively segmented as needed, for example, 5 to 10 outer wall segments 1 are set.

[0028] 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 a tubular structure with an airfoil cross-section, wherein two sets of corresponding ends of the outer wall and the inner wall are connected. The outer wall is formed by multiple outer wall segments connected in sequence, and the inner wall is formed by multiple inner wall segments connected in sequence. Both the outer wall segments and the inner wall segments are sandwich structures with composite material skin covering foam core material. The first parting surface between the two outer wall segments and the second parting surface between the two inner wall segments are offset from each other.

2. The large-size rotary cylinder according to claim 1, characterized in that, It also includes multiple sets of circumferential reinforcing mechanisms, each of which is disposed between the inner wall and the outer wall and is distributed at intervals along the axial direction; The circumferential reinforcing mechanism includes a plurality of circumferential reinforcing ribs distributed at intervals along the circumferential direction, and all the second parting surfaces are provided with the circumferential reinforcing ribs.

3. The large-size rotary cylinder according to claim 2, characterized in that, The circumferential reinforcing ribs are provided across part or all of the first parting surface.

4. The large-size rotary cylinder according to claim 1, 2, or 3, characterized in that, Each of the inner wall segments has an inwardly flanged flange extending toward the inner surface of the inner wall segment on both its left and right sides. The two inner flanges on adjacent sides of the two adjacent inner wall segments are fixedly connected by bolts.

5. The large-size rotary cylinder according to claim 1, 2, or 3, characterized in that, An inner wall recessed structure is provided on the outer side of the inner wall corresponding to the second parting surface, and the inner wall recessed structure is filled with an inner wall outer surface reinforcement layer.

6. The large-size rotary cylinder according to claim 1, 2, or 3, characterized in that, The outer side of the outer wall surface is provided with an outer wall recessed structure at the position corresponding to the first parting surface, and the outer wall recessed structure is filled with an outer wall surface reinforcement layer.

7. The large-size rotary cylinder according to claim 1, 2, or 3, characterized in that, The number of inner wall lobes is less than the number of outer wall lobes.

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