Reinforcing method of ship ventilation pipe reserved opening, ventilation grid installation method and ventilation pipe

Abstract

The application discloses a reinforcing method of a ship ventilation pipe reserved opening, a ventilation grille installation method and a ventilation pipe, and relates to the technical field of ship ventilation. The reinforcing method comprises the following steps: in the field production stage of the ship ventilation pipe, bending an inner edge of the reserved opening to form an integral inner edge with the pipe wall, so as to improve the rigidity of the reserved opening, prevent deformation during transportation and segmented pre-installation, and enable the ventilation grille installation to be free of high-altitude correction operation. The application can avoid deformation of the reserved opening from the source, save the high-altitude correction process, eliminate safety hazards and reduce construction costs. The application can effectively improve the technical problems in the prior art, such as the difficulty in ventilation grille installation caused by the deformation of the reserved opening of the ship ventilation pipe and the need for high-altitude correction operation, and is suitable for the industrialized production of rectangular thin steel plate ventilation pipes of various ships.

Description

Technical Field

[0001] This application relates to the technical field of ship ventilation grilles, and in particular to a method for reinforcing the reserved opening of a ship ventilation pipe, a method for installing the ventilation grille, and a ventilation pipe. Background Technology

[0002] The main materials for the rectangular duct body of a ship are ordinary thin steel plates and galvanized steel plates. Their walls are relatively thin, and during fabrication, pre-drilled openings are made in the manufacturing process to accommodate ventilation accessories such as ventilation grilles, stainless steel mesh, and louvers. These pre-drilled openings often deform to varying degrees during fabrication and transportation. Large deformations require correction before the ventilation grilles and other accessories are installed. In actual installation, however, minor deformations are often forced into installation, resulting in inflexible and clumsy operation of the opening, closing, lifting, and rotating parts of the ventilation accessories.

[0003] For work in confined spaces, straightening deformed areas using sheet metal or even hot work requires the coordinated efforts of various trades, including scaffolding. This not only poses safety hazards related to working at heights and the risk of electric shock, but also involves an enormous workload, potentially impacting the construction schedule. Furthermore, after the ventilation grilles are installed, ensuring a tight connection between the pre-reserved openings and the deformed areas is difficult. Summary of the Invention

[0004] The purpose of this invention is to provide a method for reinforcing the reserved opening of a ship's ventilation pipe, a method for installing a ventilation grille, and a ventilation pipe, so as to solve the technical problems in the prior art where the reserved opening of a ship's ventilation pipe is easily deformed, making the installation of the ventilation grille difficult and requiring high-altitude correction operations.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] On the one hand, a method for strengthening the reserved opening of a ship's ventilation duct is provided, which includes: During the in-house fabrication stage of the ship's ventilation duct, the edge of the reserved opening of the ventilation duct is bent inward to form an inner folded edge that is integrally formed with the duct wall. The inner folded edge is used to enhance the structural rigidity of the reserved opening to prevent it from deforming during transportation and segmented pre-assembly, and to eliminate the need for high-altitude straightening operations when installing the subsequent ventilation grille.

[0007] Preferably, the inner fold formed by the bending process is one of a single bending structure, a multiple folding structure, a wedge structure, or a streamlined fold structure with a rounded transition. The single-bending structure has a fold height of 30mm and an angle of 90° with the ventilation duct wall; the multi-folding structure is formed by multiple bends to create a U-shaped fold or a Z-shaped fold; the wedge-shaped structure has an acute angle with the ventilation duct wall; and the streamlined flange structure with a rounded transition forms a bell-shaped opening at the reserved opening.

[0008] Preferably, when the inner folded edge is a multi-folded structure, the multi-folded structure is formed by bending the reserved opening edge inward by 90° to form a first vertical edge, and then bending the end of the first vertical edge to form a U-shaped back fold or a Z-shaped fold to form a closed or semi-closed cavity, and structural adhesive or damping material for absorbing vibration energy during ship navigation is pre-placed in the interlayer. When the inner folded edge is a wedge-shaped structure, the acute angle range is 80° to 85°, and the method further includes: setting the reserved opening edge folded edge as an inwardly inclined wedge-shaped surface, and providing a ventilation grille frame with a reverse wedge-shaped groove, and using a locking member to make the wedge-shaped structure and the reverse wedge-shaped groove produce a wedge effect to form a radial preload force to resist ship vibration; When the inner fold is a streamlined flange structure with a rounded transition, the streamlined flange structure is formed into a bell-shaped opening with a rounded transition by CNC stamping or spinning, and rivet nuts or rivet holes are pre-made in the flange area to avoid damaging the anti-corrosion coating by drilling on site.

[0009] Preferably, the bending process is performed along the longer side in the flow direction.

[0010] Preferably, before bending at the edge of the reserved opening of the ventilation duct, the procedure further includes: Based on the piping system schematic diagram, arrange the path of the rectangular duct, determine the size, quantity, and location of the ventilation grilles, and clarify the technical requirements.

[0011] On the other hand, this disclosure also provides a method for installing a ship ventilation grille, which includes: Arrange rectangular ventilation ducts and determine the installation location and dimensions of ventilation grilles; When fabricating ventilation ducts in the interior, a reserved opening is made at the installation location of the ventilation grille, and the reserved opening is reinforced using any of the methods described above; After the ventilation duct is treated with anti-corrosion measures, a ventilation grille is installed at the reserved opening.

[0012] Furthermore, this disclosure also provides a ship ventilation pipe, which includes: tube body; At least one reserved opening is provided on the pipe body; and A flange structure located at the edge of the reserved opening and extending into the interior of the tube; The flange structure is integrally formed from the raw material of the tube body.

[0013] Preferably, the flange structure is a single-bending structure with a flange height of 30mm and an angle of 90° with the pipe wall.

[0014] Preferably, the flange structure is a multi-fold structure, which is a U-shaped fold structure or a Z-shaped fold structure, and its interlayer is provided with structural adhesive or damping material.

[0015] Preferably, the flange structure is a wedge-shaped structure with an angle of 80° to 85° with the pipe wall; or the flange structure is a streamlined flange structure with a rounded transition, forming a bell-shaped opening, and the flange is pre-fabricated with rivet nuts or rivet holes.

[0016] The beneficial effects of this application are as follows: By implementing an integrated, inwardly folded edge reinforcement treatment on the pre-reserved openings during the fabrication stage of the ship's ventilation ducts, the rigidity and deformation resistance of the pre-reserved openings can be improved from the structural source. This effectively prevents warping, denting, and twisting deformation of the ducts during fabrication, transportation, and segmented pre-assembly, eliminating the need for high-altitude straightening work during subsequent ventilation grille installation. This completely eliminates the safety risks associated with high-altitude work, electric shock, and multi-trade coordination in traditional processes. Simultaneously, it significantly reduces labor input, shortens the construction cycle, and substantially lowers shipbuilding costs. Attached Figure Description

[0017] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a top view of the structural diagram of a ship ventilation duct according to an embodiment of this application; Figure 2 This is a front view structural schematic diagram of a ship ventilation duct according to an embodiment of this application; Figure 3 for Figure 2 A cross-sectional structural diagram of AA; Figure 4 for Figure 3 The enlarged inner fold at point a is a schematic diagram of a U-shaped fold structure with multiple folds; Figure 5 for Figure 3 The enlarged inner fold at point a is a schematic diagram of a Z-shaped fold structure with multiple folds; Figure 6 for Figure 3 The enlarged inner fold at point a is a schematic diagram of a wedge-shaped structure; Figure 7 for Figure 3 The enlarged inner fold at point a is a streamlined flange structure with a rounded transition.

[0019] In the picture: 100. Ventilation duct; 101. Pipe body; 110. Reserved opening; 111. Inner fold. Detailed Implementation

[0020] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] like Figures 1 to 7 As shown, this embodiment provides a method for strengthening the reserved opening 110 of a ship ventilation pipe 100. By strengthening the reserved opening 110 through this method, the problem that the reserved opening 110 of the ship ventilation pipe 100 is easily deformed in the prior art, which leads to difficulties in installing the ventilation grille and requires high-altitude correction operations can be improved.

[0024] Specifically, the reinforcement method for the reserved opening 110 of the ship ventilation duct 100 provided by the present invention includes: during the in-house fabrication stage of the ship ventilation duct 100, bending is performed at the edge of the reserved opening 110 of the ventilation duct 100 towards the inside of the ventilation duct 100 to form an inner folded edge 111 integrally formed with the duct wall. The inner folded edge 111 is used to enhance the structural rigidity of the reserved opening 110, preventing deformation during transportation and segmented pre-assembly, thereby eliminating the need for high-altitude straightening operations during the subsequent installation of the ventilation grille.

[0025] Furthermore, the inner fold 111 formed by the bending process is integrally molded with the wall of the ventilation duct 100, which can effectively enhance the structural rigidity of the reserved opening 110 and ensure its flatness during transportation and segmented pre-assembly. Subsequent installation of the ventilation grille eliminates the need for rubber padding or forced adjustment, thus achieving a smooth, gapless connection between the ventilation grille and the duct, ensuring aesthetic appeal, and effectively guaranteeing the airtightness between the ventilation grille and the duct to prevent air leakage.

[0026] In one embodiment, the inner fold 111 formed by the bending process can be one of a single bending structure, a multiple folding structure, a wedge structure, or a streamlined folding structure with a rounded transition.

[0027] Specifically, the fold height of the single-bend structure is 30mm, and the angle between it and the wall of the ventilation duct 100 is 90°. The 30mm fold height can increase the moment of inertia of the section, thereby improving the bending and torsional resistance of the reserved opening 110 and preventing deformation during transportation and segmented pre-assembly.

[0028] Furthermore, the multi-fold structure is formed by multiple bends to create U-shaped or Z-shaped folds. These multiple bends create closed or semi-closed cavities, within which structural adhesive or damping materials can be pre-placed. The composite cross-section formed by multiple folds significantly increases the moment of inertia, resulting in a substantial improvement in bending and torsional stiffness compared to a single fold, enabling it to withstand severe vibrations and impacts during ship navigation. Simultaneously, the closed or semi-closed cavities formed by the folds, combined with the pre-placed structural adhesive or damping materials, absorb and dissipate vibration energy, effectively reducing vibration transmission and extending the service life of ducts and ventilation grilles.

[0029] Furthermore, the angle between the wedge-shaped structure and the wall of the ventilation duct 100 is an acute angle. The acute angle between the folded edge of the wedge-shaped structure and the duct wall forms an inwardly inclined wedge-shaped surface. Combined with the ventilation grille frame with a reverse wedge-shaped groove, a wedge effect is generated through the locking element. Utilizing the elastic rebound characteristics of the metal sheet, a continuous radial preload is generated during locking, forming a "wedge effect." Under long-term vibration, the bolts are not easily loosened, possessing a self-locking function. Simultaneously, the tight fit between the wedge-shaped surface and the reverse wedge-shaped groove achieves a high-precision seal between metals, eliminating the need for rubber gaskets and avoiding seal failure caused by rubber aging.

[0030] Furthermore, the streamlined flange structure with a rounded transition forms a bell-shaped opening at the reserved opening 110. This rounded-transition streamlined flange structure can be formed into a bell-shaped opening using CNC stamping or spinning, and the flange area is pre-fabricated with rivet nuts or rivet holes. The rounded-transition streamlined flange structure guides airflow smoothly, avoiding airflow separation and eddies caused by right-angle folds, thus significantly reducing the local drag coefficient. Simultaneously, the pre-fabricated rivet nuts or rivet holes eliminate the need for on-site drilling when installing the ventilation grille, preventing damage to the internal and external anti-corrosion coatings of the duct and extending the duct's service life.

[0031] Specifically, for the ship ventilation pipe 100, the reinforcing structure at the edge of its reserved opening 110 includes at least one of the above embodiments.

[0032] In one embodiment, when the inner folded edge 111 is a multi-folded structure, the multi-folded structure forms a first vertical edge by bending the edge of the reserved opening 110 inward by 90°, and then bending the end of the first vertical edge to form a U-shaped back fold or a Z-shaped fold, so as to form a closed or semi-closed cavity, and pre-places structural adhesive or damping material in the interlayer to absorb the vibration energy during the ship's navigation.

[0033] Understandably, the closed or semi-closed cavity formed by multiple folds inherently possesses certain structural damping characteristics. Furthermore, the pre-placement of structural adhesive or damping material within the interlayer creates a composite structure of "metal-damping material-metal." The structural adhesive or damping material exhibits high internal friction characteristics, converting mechanical vibration energy into heat energy for dissipation, effectively reducing the amplitude of vibration transmitted to the ventilation grille and surrounding structures. Simultaneously, when the duct is subjected to external impact, the multiple folds and damping material work synergistically to buffer and absorb energy, protecting the ventilation grille and its moving parts from damage.

[0034] Furthermore, when the inner folded edge 111 is a wedge-shaped structure, the acute angle range is 80° to 85°, and the method further includes: setting the edge fold of the reserved opening 110 as an inwardly inclined wedge-shaped surface, and providing a ventilation grille frame with a reverse wedge groove, so that the wedge structure and the reverse wedge groove generate a wedge effect through the locking member, forming a radial preload force to resist ship vibration.

[0035] Furthermore, when the inner fold 111 is a streamlined flange structure with a rounded transition, the streamlined flange structure is formed into a bell-shaped opening with a rounded transition by CNC stamping or spinning, and rivet nuts or rivet holes are prefabricated in the flange area to avoid damaging the anti-corrosion coating by drilling on site.

[0036] It should be noted that the bending treatment is performed on the long side of the reserved opening 110 in the direction of the flow.

[0037] Understandably, the longest side of the rectangular duct opening 110 is the part with the largest span and weakest rigidity among the opening edges, making it most susceptible to bending deformation during transportation and segmented pre-assembly. Therefore, placing the bending treatment on the longitudinal side in the flow direction allows for maximum structural rigidity enhancement with minimal material input. Simultaneously, it eliminates the need to reinforce all four sides of the opening 110; reinforcing only the longitudinal side in the flow direction is sufficient to meet structural rigidity requirements, saving raw materials and processing costs. The fold along the longitudinal side enhances the bending stiffness of the duct opening along its length, effectively resisting external forces during transportation, hoisting, and segmented pre-assembly.

[0038] In one embodiment, the method further includes a step prior to bending: arranging the path of the rectangular duct according to the duct system schematic diagram, determining the size, quantity, and location of the ventilation grilles, and clarifying the manufacturing technical requirements.

[0039] Understandably, before ductwork fabrication, systematically planning the duct path using a piping schematic diagram and precisely determining the installation location, size, and quantity of ventilation grilles ensures that the reserved opening 110 perfectly matches the subsequent ventilation grille installation requirements. This effectively avoids deviations in the reserved opening 110 position due to unreasonable path layout, preventing interference with the ship's structure or other pipelines during installation. Furthermore, determining the ventilation grille specifications in advance ensures that the reserved opening 110 size precisely corresponds to the ventilation grille, eliminating the need for on-site hole enlargement or repairs.

[0040] Furthermore, by incorporating the planning results from the design phase into the interior fabrication drawings in the form of "clear technical requirements," the fabrication personnel are informed in advance of the reinforcement requirements for the reserved opening 110. Moreover, the reinforcement of the reserved opening 110 is completed simultaneously during duct fabrication, eliminating the need for subsequent rework or secondary processing.

[0041] On the other hand, the present invention also provides a method for installing a ship ventilation grille, comprising: Arrange rectangular ventilation ducts 100 and determine the installation location and dimensions of ventilation grilles; When fabricating the ventilation duct 100 in the interior, a reserved opening 110 is made at the installation position of the ventilation grille, and the reserved opening 110 is reinforced by the method described in any of the above embodiments. After the ventilation duct 100 is treated with anti-corrosion measures, a ventilation grille is installed at the reserved opening 110.

[0042] For example, during the construction of a ship, the rectangular duct body is made of galvanized steel sheet with a wall thickness of 2.5mm. Based on the duct system schematic diagram, it is determined that several ventilation grilles need to be installed. After the location and size of the reserved opening 110 are determined by the design, the technical requirements are clearly stated on the fabrication drawings.

[0043] During the interior fabrication stage, at the long edge of the pre-reserved opening 110 along the flow direction, a bending machine is used to bend the duct inward at a 90° angle, forming an inner folded edge 111 with a height of 30mm. This inner folded edge 111 is integrally formed with the duct wall, requiring no additional welding reinforcement.

[0044] After the ductwork is manufactured, it undergoes anti-corrosion treatment such as rust removal and internal and external anti-rust primer coating before being transported to the section installation site.

[0045] Understandably, since the reserved opening 110 has been reinforced, it has good flatness and no deformation, so installers can directly attach and fix the ventilation grille to the reserved opening 110 without any correction or shim adjustment. Moreover, after installation, the ventilation grille can open and close flexibly, and can achieve a tight fit with the duct wall without gaps, thus ensuring good sealing performance.

[0046] On the other hand, the present invention also provides a ship ventilation pipe 100, which includes a pipe body 101, at least one reserved opening 110 opened on the pipe body 101, and a flange structure provided at the edge of the reserved opening 110 and extending into the pipe body 101. The flange structure is integrally formed from the raw material of the pipe body 101.

[0047] In one embodiment, the flange structure is a single-bend structure with a flange height of 30mm and an angle of 90° with the pipe wall of the tube body 101. It is understood that the 30mm flange height can increase the moment of inertia of the cross-section, thereby improving the bending and torsional resistance of the reserved opening 110 and preventing deformation during transportation and segmented pre-assembly. Alternatively, the flange structure can be a multi-fold structure, which is a U-shaped fold or a Z-shaped fold, and its interlayer contains structural adhesive or damping material.

[0048] In one embodiment, the flange structure is a wedge-shaped structure with an angle of 80° to 85° with the wall of the tube body 101; or, the flange structure is a streamlined flange structure with a rounded transition, forming a bell-shaped opening, and the flange is pre-fabricated with rivet nuts or rivet holes.

[0049] Understandably, changing the folding angle from the traditional 90° to an acute angle of 80°-85° creates an inwardly inclined wedge-shaped surface. Simultaneously, utilizing the inherent elasticity of the metal sheet, a continuous radial preload is generated during installation and tightening, creating a "wedge effect." This wedge effect ensures the connection is automatically in a preloaded state after tightening, preventing loosening even under long-term vibration conditions and eliminating the need for frequent inspection and tightening. Therefore, it effectively solves the problem of bolt loosening and seal failure after long-term shipboard vibration caused by traditional 90° folding, significantly reducing maintenance costs.

[0050] In summary, this invention discloses a method for reinforcing the reserved opening 110 of a ship's ventilation duct 100, a method for installing ventilation grilles, and the ventilation duct 100 itself. By implementing an integrally formed inner folded edge 111 reinforcement treatment on the edge of the reserved opening 110 during the on-site fabrication stage of the ship's ventilation duct 100, the rigidity and deformation resistance of the reserved opening 110 can be improved from the structural root. This effectively avoids warping, denting, and twisting deformation of the duct during fabrication, transportation, and segmented pre-assembly, eliminating the need for high-altitude straightening operations during subsequent ventilation grille installation, and completely eliminating the safety risks associated with high-altitude operations, electric shock, and multi-trade coordination in traditional processes. Simultaneously, it can significantly reduce labor input, shorten the construction cycle, and significantly reduce shipbuilding costs.

[0051] Employing multiple reinforcing structures such as single bending, multiple folds, wedge self-locking, and streamlined flanges, the ventilation grille can be installed without rubber padding or forced adjustments. After assembly, it is flat and gapless, with smooth and flexible opening and closing, improving ventilation tightness and appearance. The closed or semi-closed cavities formed by multiple folds, combined with damping materials, can absorb vibration energy, reduce impact loads, improve structural fatigue resistance, and adapt to the complex vibration environment of ships during navigation.

[0052] The wedge-shaped reinforcement structure utilizes metal elasticity and the wedge effect to achieve radial pre-tightening and self-locking, maintaining a tight connection and reliable seal even under long-term vibration. It achieves gasket-free self-sealing between metals, avoiding the aging and failure problems of traditional rubber seals. The streamlined flange with a rounded transition optimizes airflow paths, reduces airflow separation and eddy current generation, lowers wind resistance and airflow regeneration noise, and improves ventilation system efficiency. Pre-fabricated rivet nuts or rivet holes in the flange area avoid on-site drilling that could damage the anti-corrosion coating, extending the overall service life of the ventilation duct by 100%.

[0053] Based on this, the present invention can be directly integrated into the existing ship interior manufacturing process, with strong versatility and outstanding economy. It can comprehensively improve the problems of easy deformation, difficult installation, poor sealing and high maintenance cost of the reserved opening 110 of the ship ventilation pipe 100, and has outstanding technical advantages and significant engineering application value.

[0054] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other orientations or positional relationships are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no special meaning.

[0055] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0056] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0057] The technical principles of this application have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this application without inventive effort, and these embodiments will all fall within the scope of protection of this application.

Claims

1. A method for reinforcing a pre-reserved opening in a ship's ventilation duct, characterized in that, include: During the in-house fabrication stage of the ship ventilation pipe (100), at the edge of the reserved opening (110) of the ventilation pipe (100), a bending process is performed towards the inside of the ventilation pipe (100) to form an inner folded edge (111) integrally formed with the pipe wall. The inner fold (111) is used to enhance the structural rigidity of the reserved opening (110) to prevent it from deforming during transportation and segmented pre-assembly, and to make the subsequent installation of the ventilation grille unnecessary for high-altitude correction work.

2. The method for reinforcing the reserved opening of the ship's ventilation duct according to claim 1, characterized in that, The inner fold (111) formed by the bending process is one of a single bending structure, a multiple folding structure, a wedge structure, or a streamlined fold structure with a rounded transition. The single-bending structure has a fold height of 30mm and an angle of 90° with the wall of the ventilation pipe (100); the multi-folding structure is formed by multiple bends to form a U-shaped fold or a Z-shaped fold; the wedge structure has an acute angle with the wall of the ventilation pipe (100); the streamlined flange structure with a rounded transition forms a bell-shaped opening at the reserved opening (110).

3. The method for reinforcing the reserved opening of the ship's ventilation pipe according to claim 2, characterized in that, When the inner folded edge (111) is a multi-folded structure, the multi-folded structure forms a first vertical edge by bending the edge of the reserved opening (110) inward by 90°, and then bending the end of the first vertical edge to form a U-shaped back fold or a Z-shaped fold, so as to form a closed or semi-closed cavity, and a structural adhesive or damping material for absorbing the vibration energy during the ship's navigation is pre-placed in the interlayer. When the inner fold (111) is a wedge structure, the acute angle range is 80° to 85°, and the method further includes: setting the edge fold of the reserved opening (110) as an inwardly inclined wedge surface, and providing a ventilation grille frame with a reverse wedge groove, and using a locking member to make the wedge structure and the reverse wedge groove produce a wedge effect to form a radial preload force to resist ship vibration; When the inner fold (111) is a streamlined flange structure with a rounded transition, the streamlined flange structure is formed into a bell-shaped opening with a rounded transition by CNC stamping or spinning, and rivet nuts or rivet holes are pre-made in the flange area to avoid damaging the anti-corrosion coating by drilling on site.

4. The method for reinforcing the reserved opening of the ship's ventilation duct according to claim 1, characterized in that, The bending process is performed along the longer side in the direction of the flow.

5. The method for reinforcing the reserved opening of a ship's ventilation duct according to claim 1, characterized in that, Before bending at the edge of the reserved opening (110) of the ventilation duct (100), the following is also included: Based on the piping system schematic diagram, arrange the path of the rectangular duct, determine the size, quantity, and location of the ventilation grilles, and clarify the technical requirements.

6. A method for installing a ship's ventilation grille, characterized in that, include: When fabricating the ventilation duct (100) in the interior, a reserved opening (110) is made at the installation position of the ventilation grille, and the reserved opening (110) is reinforced by the method described in any one of claims 1-5; After the ventilation pipe (100) is treated with anti-corrosion, a ventilation grille is installed at the reserved opening (110).

7. A ship ventilation duct, characterized in that, include: tube body(101); At least one reserved opening (110) is provided on the pipe body (101); and A flange structure is provided at the edge of the reserved opening (110) and extends into the interior of the tube body (101); The flange structure is integrally formed from the raw material of the tube body (101).

8. The ship ventilation duct according to claim 7, characterized in that, The flange structure is a single-bending structure with a flange height of 30mm and an angle of 90° with the pipe wall of the tube body (101).

9. The ship ventilation duct according to claim 7, characterized in that, The flange structure is a multi-fold structure, which is a U-shaped fold structure or a Z-shaped fold structure, and its interlayer is provided with structural adhesive or damping material.

10. The ship ventilation duct according to claim 7, characterized in that, The flange structure is a wedge-shaped structure, and the angle between it and the wall of the tube body (101) is 80° to 85°; or The flange structure is a streamlined flange structure with a rounded transition and forms a bell-shaped opening, and rivet nuts or rivet holes are pre-made on the flange.

Images