A ventilation duct for a ship which is easy to disassemble

Abstract

The utility model discloses a kind of ventilation ducts convenient to dismount for ship, belong to ventilation duct technical field, including pipeline main body, connecting assembly is installed on the pipeline main body, the connecting assembly is by first connecting ring and second connecting ring composition, the first connecting ring is fixed on pipeline main body, the second connecting ring sleeve joint is on pipeline main body, the first connecting ring outer side surface is equipped with external thread, the second connecting ring one end is equipped with internal thread groove. The utility model is limited ring design by the thread connection cooperation of first connecting ring and second connecting ring, replaces traditional multiple sets of bolt fixed mode, without special tool can complete pipeline dismounting operation. In the narrow cabin space of ship, only need to rotate second connecting ring can realize the quick butt joint and separation of adjacent pipeline main body, greatly simplify operation process, shorten maintenance operation time, improve ship ventilation system operation maintenance efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of ventilation duct technology, and in particular relates to a ventilation duct for ships that is easy to disassemble and assemble. Background Technology

[0002] As a core component of the ship's cabin ventilation system, the reliability of ship ventilation ducts and the ease of their installation and disassembly directly affect the efficiency of ship operation and maintenance.

[0003] In existing ship ventilation duct connection technologies, the utility model patent with authorization announcement number CN217477540U adopts a connection method in which the first mounting plate and the second mounting plate are fixed with bolts. Although this can ensure structural stability, it has significant defects. Another example is the central air conditioning ventilation mechanism related technology with application number 202320656357.X, whose duct connection relies on the assembly of multiple sets of fasteners.

[0004] The shortcomings of the existing technology are mainly reflected in the following aspects: First, the disassembly and assembly operations are cumbersome, requiring the use of special tools to unscrew the bolts one by one, resulting in extremely low work efficiency in the confined space of a ship's cabin, and time-consuming and labor-intensive maintenance; Second, the connection structure has poor adaptability, and the combination design of the mounting plate and bolts requires high installation accuracy, which can easily lead to sealing failure due to assembly deviation.

[0005] Therefore, it is necessary to provide a ventilation duct for ships that is easy to disassemble and assemble to solve the above-mentioned technical problems. Utility Model Content

[0006] This utility model provides a ventilation duct for ships that is easy to disassemble and assemble, solving the problems mentioned in the background art, such as the patent with authorization announcement number CN217477540U, where multiple sets of bolts need to be disassembled and assembled one by one in a confined space, and the connection of a single pipe section takes more than 15 minutes; and the technology with application number 202320656357.X, where the installation plate assembly deviation exceeds 0.5mm, resulting in sealing failure and poor adaptability.

[0007] This utility model embodiment adopts the following technical solution: a marine ventilation duct that is easy to assemble and disassemble, including a duct body, on which a connecting assembly consisting of a first connecting ring and a second connecting ring is installed. The connecting assembly and the duct body are made of the same material to ensure the compatibility and durability of the overall structure. The first connecting ring is fixed to the duct body, and the second connecting ring is sleeved on the outside of the duct body and can slide axially. The outer surface of the first connecting ring is provided with an external thread, and one end of the second connecting ring is provided with an internal thread groove, which is adapted to the external thread of the first connecting ring. A limit ring is fixed on the outer surface of the duct body opposite to the first connecting ring. The limit ring is used to axially limit the second connecting ring to prevent structural damage caused by excessive screwing. Adjacent duct bodies are connected by the threaded engagement of the first and second connecting rings. The threaded connection method can be assembled and disassembled without special tools. Combined with the limiting effect of the limit ring, it ensures connection stability and avoids sealing failure caused by assembly deviation.

[0008] A further technical solution involves multiple equidistantly distributed fixing holes on the circumference of the main pipe body, and countersunk holes corresponding to the fixing holes on the circumference of the first connecting ring. The first connecting ring is securely fixed to the main pipe body by fasteners passing through the countersunk holes and fixing holes. The heads of the fasteners are embedded in the countersunk holes to prevent the protruding structure from interfering with the fitting and sliding of the second connecting ring. The multiple equidistantly distributed fixing holes can evenly distribute the force, further improving the structural strength and stability of the connection between the first connecting ring and the main pipe body, and preventing the connection from loosening due to vibration during ship navigation.

[0009] A further technical solution involves a sealing rubber ring fitted onto the outer surface of the main pipe body. The sealing rubber ring is located between the first connecting ring and the second connecting ring. Its inner side fits against the outer side of the main pipe body, and its outer side fits against the inner side of the internal thread groove of the second connecting ring. After adjacent main pipe bodies are joined, the sealing rubber ring is squeezed to form a sealing structure, effectively preventing leakage during ventilation and enhancing the sealing performance of the connection.

[0010] A further technical solution is to match the inner diameter of the first connecting ring and the second connecting ring with the outer diameter of the pipe body, ensuring that the first connecting ring is fitted and fixed to the pipe body and the second connecting ring slides smoothly along the pipe body, thus ensuring the assembly accuracy of the connecting components and the pipe body, and thereby improving the stability and sealing of the overall connection.

[0011] A further technical solution is to match the distance between the limiting ring and the nearest end face of the pipe body with the depth of the internal thread groove, so that when the second connecting ring is screwed to the limit position through thread engagement, its end face can accurately abut against the limiting ring. This ensures both the engagement depth of the threaded connection and reliable axial limiting, avoiding excessive screwing that could damage the threads or cause excessive deformation of the sealing rubber ring.

[0012] A further technical solution involves providing multiple fixing holes, which are equidistantly located on the periphery of the pipe body. This equidistant distribution of fixing holes ensures more uniform stress distribution between the first connecting ring and the pipe body, further enhancing connection strength and stability, adapting to the vibration environment during ship navigation, and preventing loosening of the connection.

[0013] A further technical solution involves using the same material as the main body of the duct to ensure consistency in material properties between the connecting components and the main body of the duct. This avoids problems such as asynchronous thermal expansion and contraction or inconsistent corrosion resistance caused by material differences, extending the overall service life of the ventilation duct while improving structural compatibility and assembly reliability.

[0014] The above-mentioned technical solutions adopted in the embodiments of this utility model can achieve the following beneficial effects: The threaded connection between the first and second connecting rings, combined with a limiting ring design, replaces the traditional multi-bolt fixing method, allowing for pipe assembly and disassembly without the need for special tools. In the confined space of a ship's cabin, simply rotating the second connecting ring enables rapid docking and separation of adjacent pipe sections, significantly simplifying the operation process, shortening maintenance time, and improving the operational efficiency of the ship's ventilation system. Simultaneously, the threaded connection, combined with the axial limiting effect of the limiting ring, ensures the stability of the connection structure, effectively preventing sealing failures caused by assembly deviations. This adapts to the precision requirements of complex ship installation environments. Multiple equidistant fixing holes on the circumference of the pipe section, along with countersunk holes on the first connecting ring, and fasteners, ensure a secure assembly between the first connecting ring and the pipe section. The multiple equidistant fixing holes evenly distribute force, enhancing the structural strength and stability of the connection between the first connecting ring and the pipe section, preventing loosening due to vibrations during ship navigation. The countersunk hole design allows the fastener head to be embedded, preventing protruding structures from affecting the engagement and rotation of the second connecting ring, ensuring smooth threaded connection operations, and guaranteeing the reliability of the connection between the components and the pipe section, thus extending the service life of the ventilation duct. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 A schematic diagram of a ventilation duct for ships that is easy to disassemble and assemble, provided by this utility model; Figure 2 A schematic diagram of the connection component structure provided by this utility model; Figure 3 A schematic diagram of the first connecting ring structure provided by this utility model; Figure 4This is a schematic diagram of the second connecting ring structure provided by this utility model; Figure 5 A schematic diagram of the fixing hole structure provided by this utility model; Figure 6 A schematic diagram of the limiting ring structure provided by this utility model; Figure 7 A schematic diagram of the sealing rubber ring structure provided by this utility model.

[0016] Figure Labels 1. Pipe body; 2. Connecting components; 3. First connecting ring; 4. Second connecting ring; 5. External thread; 6. Countersunk hole; 7. Internal thread groove; 8. Limiting ring; 9. Sealing rubber ring; 10. Fixing hole. Detailed Implementation

[0017] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0018] Please refer to the following: Figure 1-7A detachable ventilation duct for ships includes a duct body 1, which is made of a marine-grade corrosion-resistant alloy material. This material possesses high strength, resistance to seawater erosion, and resistance to alternating high and low temperatures, making it suitable for the complex environment of ship cabins, characterized by humidity, high salt spray concentration, and frequent temperature fluctuations. A connecting assembly 2 is installed on the duct body 1. The connecting assembly 2 consists of a first connecting ring 3 and a second connecting ring 4. The connecting assembly 2 is integrally machined from the same corrosion-resistant alloy material as the duct body 1, ensuring a high degree of consistency in material properties and preventing asynchronous thermal expansion and contraction caused by material differences. During ship navigation, the temperature range can exceed 50°C from tropical to frigid seas; the matching thermal expansion coefficients of the same material prevent gaps at the connection points. During installation, first confirm using a laser rangefinder that the limiting ring 8 is firmly fixed to the outer surface of the pipe body 1 by argon arc welding, and that the center of the limiting ring 8 is completely coincident with the axis of the pipe body 1, ensuring that it is located opposite the first connecting ring 3 and perpendicular to the pipe axis. Then, smoothly fit the second connecting ring 4 onto the outer side along the axial direction of the pipe body 1. The inner wall of the second connecting ring 4 is precision polished, with a surface roughness controlled below Ra0.8μm, allowing it to slide smoothly along the pipe body 1 without radial displacement, and with a sliding resistance of less than 5N. Then... The first connecting ring 3 is aligned with the preset installation position of the pipe body 1, and is temporarily fixed by the positioning pin before being permanently fixed. The outer surface of the first connecting ring 3 is provided with an M30×2.5 external thread 5. The thread profile is a trapezoidal thread, which has the advantages of strong load-bearing capacity and resistance to vibration and loosening. One end of the second connecting ring 4 is provided with an internal thread groove 7 that precisely matches the external thread 5. The meshing gap between the external thread 5 and the internal thread groove 7 is controlled between 0.05-0.1mm to form a tight thread meshing fit, providing a stable and detachable connection base for the docking of adjacent pipes. When two adjacent pipe bodies 1 are connected, the operator does not need to use special tools such as wrenches. Simply by manually rotating the second connecting ring 4, the internal thread groove 7 can gradually engage with the external thread 5 of the first connecting ring 3 of the other pipe body 1. During the thread engagement process, the lead design of the trapezoidal thread ensures a smooth connection. As the turning action continues, the ends of the two pipe bodies 1 gradually approach each other until the end face of the second connecting ring 4 is completely abutted against the limiting ring 8. The limiting ring 8 is 10mm thick, and its end face is machined by a surface grinder with a flatness error of no more than 0.02mm. It can accurately play the role of axial limiting and effectively prevent excessive turning from causing thread deformation, breakage, or failure of the sealing structure. All components work together. The threaded connection method not only simplifies the disassembly and assembly process, allowing a single person to complete the operation, but also solves the problem of traditional bolt fixing requiring multiple people and being cumbersome. At the same time, the limiting ring 8 and the threaded engagement form a double guarantee, ensuring connection stability and achieving the dual technical effects of easy disassembly and reliable connection. The inner diameters of the first connecting ring 3 and the second connecting ring 4 are fitted with the outer diameter of the pipe body 1 using a tolerance of H7 / h6 to form a precise fit. During installation, the inner side of the first connecting ring 3 is tightly fitted to the outer side of the pipe body 1, with a gap between the fitting surfaces not exceeding 0.03mm. After installation, it is fixed by welding or fasteners to ensure that there is no loosening or radial offset after fixing. The inner side of the second connecting ring 4 is also fitted to the outer side of the pipe body 1 using a tight fitting sleeve method. During the sliding process, the circumferential rotation is restricted by the guide edge on the outer side of the pipe body 1, and it always remains coaxial with the pipe body 1. The coaxiality error is controlled within 0.1mm, and there is no tilting or shaking. This high-precision diameter-fitting structure ensures the assembly accuracy of the first connecting ring 3 and the pipe body 1 through extremely small assembly gaps, avoiding uneven stress on the connection parts due to excessive gaps, which could lead to vibration and loosening. On the other hand, the smooth contact surface and guide structure ensure that the second connecting ring 4 slides smoothly along the axial direction of the pipe body 1, and that the external thread 5 and the internal thread groove 7 can be precisely aligned and meshed during threaded connection, without thread misalignment or jamming. By improving assembly accuracy and smoothness of movement, it synergistically ensures the stability and ease of operation of the overall connection structure, providing a solid structural foundation for easy disassembly and reliable connection. The distance between the limiting ring 8 and the nearest end face of the pipe body 1 is set to 25mm, forming a precise fit with the 25mm depth of the internal thread groove 7. During installation, rotating the second connecting ring 4 gradually engages the internal thread groove 7 with the external thread 5 of the first connecting ring 3. When the threads are fully engaged, the end face of the second connecting ring 4 away from the internal thread groove 7 is precisely against the limiting ring 8, forming a surface contact axial limiting fit with a contact area of ​​not less than 80%. This fit precisely limits the turning stroke of the second connecting ring 4 through the mechanical structure, preventing excessive turning that could cause the threads to bear axial forces beyond their tolerance range. The coordinated fit between the limiting ring 8 and the depth of the internal thread groove 7 ensures that the engagement depth of the threaded connection reaches 25mm, ensuring that the connection strength meets the pressure requirements of the ship's ventilation duct, while also protecting the connecting components, reducing thread wear and seal wear, and maintaining the integrity and service life of the overall structure. A fixing hole 10 is formed on the side of the main pipe body 1. The fixing hole 10 is a through hole with a diameter of φ8mm. The hole wall is tapped to form an M8 internal thread. A countersunk hole 6 is formed on the side of the first connecting ring 3. The diameter of the countersunk hole 6 is 10mm and the countersunk depth is 5mm, which is precisely matched with the head size of the M8 socket head cap screw. During installation, the fixing hole 10 is first machined at the corresponding position on the main pipe body 1 using a CNC drilling machine. During the machining process, a positioning fixture is used to ensure that the axis of the fixing hole 10 is perpendicular to the radial direction of the main pipe body 1, with a perpendicularity error not exceeding 0.05mm. The countersunk hole 6 on the first connecting ring 3 is precisely aligned with the fixing hole 10 using a positioning pin, with a coaxiality error controlled within 0.1mm. Then, the M8 socket head cap screw is used as a fastener to pass through the countersunk hole 6 and the fixing hole 10. The tightening torque of the bolt is controlled at... This design achieves a detachable and fixed connection between the first connecting ring 3 and the pipe body 1. The fastener head is fully embedded in the countersunk hole 6 to a depth of not less than 1 mm, and its top is flush with the outer surface of the first connecting ring 3. This avoids interference from the protruding structure with the fitting, sliding, and rotation of the second connecting ring 4, ensuring smooth assembly and operation of the second connecting ring 4. Testing showed that the gap between the second connecting ring 4 and the outer surface of the first connecting ring 3 remained at 1-2 mm during sliding, without any frictional obstruction. The fixing holes 10 provide a stable mounting point for the first connecting ring 3. The distribution of multiple fixing holes 10, combined with the multi-point fixing of the fastener, evenly distributes the axial and radial forces borne by the first connecting ring 3 onto the pipe body 1, effectively resisting the impact forces from engine vibration and wave impact during ship navigation. Through the synergistic effect of structural fit and force distribution, both the connection strength between the first connecting ring 3 and the pipe body 1 is improved, and the overall assembly smoothness is ensured. Six fixing holes 10 are provided, and these six fixing holes 10 are evenly distributed at equal intervals along the circumference of the pipe body 1. The central angle between two adjacent fixing holes 10 is 60°. During installation, the six countersunk holes 6 on the first connecting ring 3 correspond one-to-one with the six fixing holes 10 on the pipe body 1. Each fixing hole 10 is fixed to the first connecting ring 3 by an M8 socket head cap bolt. The bolt is made of 304 stainless steel, which has good corrosion resistance and mechanical strength. The six evenly distributed fixing holes 10 ensure that the stress points of the fasteners are evenly distributed along the circumference of the pipe body 1, which can evenly distribute the vibration stress generated during ship navigation to the pipe body 1 and the first connecting ring 3. This uniform stress structure design, combined with the multi-point fixing of the fasteners, effectively adapts to the vibration environment of the ship's cabin, significantly improves the stability and durability of the connection between the first connecting ring 3 and the pipe body 1, and provides a solid guarantee for the reliability of the overall pipe connection. A sealing rubber ring 9 is fitted onto the outer surface of the pipe body 1. The sealing rubber ring 9 is made of fluororubber, possessing resistance to high and low temperatures (-20℃ to 120℃), oil, and salt spray corrosion. Its Shore hardness is 70±5HA, exhibiting good elastic recovery. During installation, the sealing rubber ring 9 is fitted into the annular groove on the outer side of the pipe body 1. The width of the annular groove is 0.5mm larger than the thickness of the sealing rubber ring 9, and the depth is consistent with the radius of the sealing rubber ring 9, ensuring it is accurately positioned between the first connecting ring 3 and the second connecting ring 4 to prevent misalignment. The inner side of the sealing rubber ring 9 fits tightly against the annular groove on the outer side of the pipe body 1, with no air bubbles or gaps on the mating surface. The outer side precisely matches the inner side of the internal thread groove 7 of the second connecting ring 4, with a fit gap not exceeding 0.05mm, forming a gapless fit. When adjacent pipe bodies 1 approach each other via threaded connections, the sealing rubber ring 9 is subjected to bidirectional compression from the first connecting ring 3 and the second connecting ring 4. Its elastic deformation can fully fill any possible tiny gaps, including machining error gaps at the pipe ends and thread meshing gaps. Through the synergistic effect of fit and elastic compression, a reliable sealing structure is constructed, and the sealing performance meets the Class 1 sealing requirements in GB / T14683-2016 standard. There is no visible leakage under an air pressure of 0.3MPa, effectively preventing air leakage during ventilation, solving the sealing failure problem caused by assembly deviations in traditional connections, and significantly improving the sealing reliability of pipe connection parts. The connecting component 2 is made of the same marine-grade corrosion-resistant alloy as the main pipe body 1. This material consistency ensures that the coefficients of thermal expansion and contraction of the connecting component 2 and the main pipe body 1 are perfectly matched, both being 12×10^-6 / ℃. During ship navigation, when faced with temperature changes, the two components can expand and contract synchronously, avoiding gaps or stress concentrations caused by differences in expansion and contraction, thus preventing loosening of the connection or structural deformation. For example, in high-temperature environments, traditional connection structures made of different materials may produce a 0.1mm / m difference in expansion and contraction, leading to sealing failure. This same-material structure, however, can control the difference in expansion and contraction within the allowable range. Simultaneously, the same material maintains consistent corrosion resistance, mechanical strength, and other properties, with tensile strength exceeding 500MPa and yield strength not less than 350MPa. This results in better fit and compatibility of the components during assembly, reducing electrochemical corrosion or mechanical wear problems caused by material differences, and lowering the electrochemical corrosion rate by more than 60%. This synergistic combination of materials not only ensures the long-term assembly accuracy of the connecting component 2 and the main body of the pipe, maintaining the assembly accuracy for more than 8 years, but also extends the overall service life of the ventilation duct, ensuring that the connection structure can remain stable and reliable in the complex operating environment of the ship, achieving the technical effects of easy disassembly and assembly and long-term durability. When assembling ship ventilation ducts, the first step is to confirm the specifications and model of the duct body 1 according to the ship's cabin installation drawings, ensuring that its diameter and length match the installation requirements. Next, check the welding and fixing of the limiting ring 8 to the duct body 1. Confirm by tapping that the limiting ring 8 is not loose, and that the weld is free of cracks, porosity, or other defects. The weld strength must reach at least 95% of the duct body material strength; this is fundamental to ensuring the accuracy of subsequent connection and positioning. Then, insert the sealing rubber ring 9 from one end of the duct body 1 and slide it axially into the outer annular groove, placing it close to the limiting ring 8. After placement, visually and tactilely inspect the sealing rubber ring 9 to ensure it is intact. The pipe body is fully embedded in the groove, with no protrusions or offset. The second connecting ring 4 is then fitted onto the same end of the pipe body 1. Its position is adjusted so that the second connecting ring 4 can slide freely along the axial direction of the pipe body 1, and is located on the side of the sealing rubber ring 9 away from the limiting ring 8. During sliding, it is ensured that the second connecting ring 4 and the pipe body 1 are not jammed and rotate flexibly. Next, the first connecting ring 3 is aligned with the corresponding installation position on the pipe body 1. Using a positioning fixture, the countersunk hole 6 of the first connecting ring 3 is aligned one-to-one with the fixing hole 10 of the pipe body 1, with the coaxiality error controlled within 0.1mm. Then, M8 hexagonal socket head cap bolts are inserted one by one through the countersunk hole 6 and the fixing hole 10, using a torque wrench according to… Tighten the torque sequentially to secure the first connecting ring 3 to the pipe body 1. At this point, the first connecting ring 3 and the sealing rubber ring 9 are adjacent to each other, with a spacing of 1-2 mm. When connecting another section of pipe body 1 that has completed the same assembly process, align the port of this section of pipe body 1 with the port of the pipe with the assembled connecting component 2, adjust the coaxiality of the two pipe sections, and then push the second connecting ring 4 by hand to slide it towards the docking port, so that its internal thread groove 7 aligns with the external thread 5 of the first connecting ring 3 of the other section of pipe body 1. During the initial engagement, gently rotate the second connecting ring 4, and continue rotating after confirming that there is no misalignment of the threads. The trapezoidal thread engagement between the external thread 5 and the internal thread groove 7 achieves a tight connection. As the second connecting ring 4 is continuously rotated, the ports of the two sections of pipe body 1 gradually approach each other, and the sealing rubber ring 9 is squeezed between the first connecting ring 3 and the second connecting ring 4 until the end face of the second connecting ring 4 completely abuts against the limiting ring 8. At this point, stop. The anti-rotation and limiting ring 8 acts as an axial limiter, preventing excessive tightening that could deform the connection structure or cause excessive compression of the sealing rubber ring 9. The precise fit between the outer diameter of the sealing rubber ring 9 and the inner diameter of the internal thread groove 7, and between the inner diameter and the outer diameter of the pipe body 1, along with the sealing force generated by elastic compression, ensures a reliable seal at the pipe connection, completing the installation of the entire pipe assembly. During disassembly, the operator only needs to manually rotate the second connecting ring 4 in the opposite direction to gradually disengage the external thread 5 from the internal thread groove 7. Once the engagement is completely disengaged, the two sections of the pipe body 1 can be easily separated. If the first connecting ring 3 needs to be removed, an Allen wrench can be used to unscrew the fixing bolts, allowing the first connecting ring 3 to be removed from the pipe body 1. The entire disassembly and assembly process requires no special tools and can be completed independently by a single person. It is convenient to operate, provides a stable connection, and ensures reliable sealing, perfectly adapting to the installation space limitations and complex operating environments of ship cabins, meeting the long-term operational needs of ship ventilation systems.

[0019] It should be noted that all components used in this application are standard parts that can be purchased from the market. The specific connection methods of each part all adopt conventional methods such as bolts, rivets, and welding, which are mature technologies in the prior art. The mechanical parts and electrical equipment all adopt conventional models in the prior art, and the circuit connections adopt conventional connection methods in the prior art. All electrical equipment is connected to an external safe power source, which will not be described in detail here. The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A marine ventilation duct that is easy to assemble and disassemble, comprising a duct body (1), characterized in that, A connecting assembly (2) is installed on the pipe body (1). The connecting assembly (2) consists of a first connecting ring (3) and a second connecting ring (4). The first connecting ring (3) is fixed on the pipe body (1), and the second connecting ring (4) is sleeved on the pipe body (1). The outer surface of the first connecting ring (3) is provided with an external thread (5), and one end of the second connecting ring (4) is provided with an internal thread groove (7). A limiting ring (8) is welded to the outer surface of the pipe body (1) opposite to the first connecting ring (3). Two adjacent pipe bodies (1) are connected by the threads of the first connecting ring (3) and the second connecting ring (4). The pipe body (1) has a fixing hole (10) on its circumferential side, and the first connecting ring (3) has a countersunk hole (6) on its circumferential side. The first connecting ring (3) is fixedly connected to the pipe body (1) by fasteners passing through the countersunk hole (6) and the fixing hole (10). A sealing rubber ring (9) is sleeved on the outer surface of the pipe body (1). The outer diameter of the sealing rubber ring (9) is equal to the inner diameter of the internal thread groove (7). The inner diameter of the sealing rubber ring (9) is equal to the outer diameter of the pipe body (1). The distance between the limiting ring (8) and the nearest end face of the pipe body (1) is less than the depth of the internal thread groove (7).

2. The easily disassembled ventilation duct for ships according to claim 1, characterized in that, The inner diameter of the first connecting ring (3) and the second connecting ring (4) is equal to the outer diameter of the pipe body (1).

3. A marine ventilation duct that is easy to disassemble and assemble according to claim 2, characterized in that, The fixing holes (10) are provided in multiple ways, and the multiple fixing holes (10) are equally spaced on the periphery of the pipe body (1).

4. A marine ventilation duct that is easy to disassemble and assemble according to claim 1, characterized in that, The connecting component (2) is made of the same material as the pipe body (1).

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