Marine pipeline sealing cover, marine ventilation system and ship

Abstract

The utility model relates to the technical field of ship equipment, and discloses a marine pipeline sealing cover, a marine ventilation system and a ship. The marine pipeline sealing cover comprises a communicating pipe and a bottom cover, a pipe opening in one end of the communicating pipe is used for being connected with a marine ventilation pipeline, the bottom cover is connected with the communicating pipe and used for blocking a pipe opening in the other end of the communicating pipe, the top face of the bottom cover further comprises a liquid drainage plane and a flow guide inclined face, the lower end of the flow guide inclined face is connected with the liquid drainage plane, and a liquid drainage hole is formed in the liquid drainage plane. Condensate water can flow to the liquid drainage plane along the flow guide inclined plane in real time and flows to the outside through the liquid drainage hole, and the situation that the condensate water is accumulated in the marine pipeline sealing cover for a long time, and consequently the marine pipeline sealing cover is corroded is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of ship equipment, in particular to a marine pipeline cover, a marine ventilation system and a ship. Background Art

[0002] Spiral air ducts have been increasingly widely used in marine ventilation systems due to their advantages such as light weight, high strength, small resistance, and small air volume loss. Pipeline covers are installed at the bottom of marine ventilation systems to solve the problem of condensate at the end.

[0003] Currently, there are some marine pipeline covers. At the bottom, a parallel sealing plate and a drain plug are used. The accumulated water at the end flows out by opening the drain plug. However, it is necessary to send someone to open the drain plug at the bottom of the cargo hold transverse bulkhead regularly. Since it is difficult to enter the bottom of the cargo hold transverse bulkhead, the manual regular drainage is not timely, and thus the situation of long-term water accumulation will occur. Generally, spiral air ducts are made of thin-walled galvanized steel sheets, and their corrosion resistance is weak. Long-term water accumulation is likely to corrode the galvanized layer.

[0004] Therefore, there is an urgent need for a marine pipeline cover that can solve the problem of long-term water accumulation in the pipeline cover and extend the service life of the marine pipeline cover. Summary of the Utility Model

[0005] The first object of the utility model is to provide a marine pipeline cover, which can solve the problem of long-term water accumulation in the pipeline cover and extend the service life of the marine pipeline cover.

[0006] The second object of the utility model is to provide a marine ventilation system, which can solve the problem of untimely condensate discharge in the marine ventilation system and extend the service life of the marine ventilation system.

[0007] The third object of the utility model is to provide a ship, which can solve the problem of reducing the temperature of the cargo hold where containers are placed and avoid irreversible damage to the ship caused by excessive cargo hold temperature.

[0008] As conceived above, the technical solution adopted by the utility model is as follows:

[0009] A marine pipeline cover, comprising:

[0010] A connecting pipe, one end of the connecting pipe is used to communicate with a marine ventilation pipeline;

[0011] A bottom cover, connected to the connecting pipe to block the other end of the connecting pipe. The top surface of the bottom cover includes a liquid drainage plane and a diversion inclined plane. The bottom end of the diversion inclined plane is connected to the liquid drainage plane, and a liquid drainage hole is arranged on the liquid drainage plane.

[0012] As an optional solution of the marine pipeline cover, the maximum dimension of the liquid drainage plane along the radial direction of the connecting pipe is 40 - 60 mm;

[0013] And / or, the diameter of the liquid drain hole is 5 - 13 mm.

[0014] As an alternative to the marine pipe cap, the communicating pipe includes a pipe body and a first outwardly turned plate. The first outwardly turned plate is connected to one axial end of the pipe body, and in the radial direction of the pipe body, the first outwardly turned plate extends outward from the pipe body.

[0015] As an alternative to the marine pipe cap, the edge of the bottom plate is bent to form an inwardly turned plate. The inwardly turned plate is located above the first outwardly turned plate and is riveted and fixed to the first outwardly turned plate.

[0016] As an alternative to the marine pipe cap, the bottom plate includes a flow guiding plate and a liquid draining plate. The flow guiding plate is provided with the flow guiding inclined surface, and the liquid draining plate is provided with the liquid draining flat surface.

[0017] As an alternative to the marine pipe cap, the communicating pipe includes a pipe body and a flange. The flange is connected to one end of the pipe body, and the flange is used for connecting the marine ventilation pipe.

[0018] As an alternative to the marine pipe cap, the flange includes a first connecting portion, and the first connecting portion is tubular.

[0019] One axial end of the first connecting portion is turned outward to form a second connecting portion.

[0020] The first connecting portion is nested with the pipe body. The first connecting portion is connected to the pipe body, and the second connecting portion is used for connecting with the marine ventilation pipe.

[0021] As an alternative to the marine pipe cap, the first connecting portion and the pipe body are fixed by rivets.

[0022] As an alternative to the marine pipe cap, seals are provided at the connection between the flange and the pipe body, and at the connection between the pipe body and the bottom cover.

[0023] A marine ventilation system includes a marine ventilation pipe and a marine pipe cap. The marine ventilation pipe is provided with an air inlet, a ventilation opening, and a drainage opening. The lower end of the drainage opening is connected to the marine pipe cap, and the opening of the pipe opening where the communicating pipe is connected to the bottom cover is arranged downward.

[0024] A ship includes a hull and a marine ventilation system. A cargo hold is arranged inside the hull, and the ventilation opening is arranged inside the cargo hold.

[0025] The beneficial effects of the present utility model are:

[0026] The utility model provides a marine pipeline cover, which comprises a connecting pipe and a bottom cover. One end of the connecting pipe is connected to a marine ventilation pipeline, and the other end is connected to the bottom cover. When there is condensate in the marine ventilation pipeline, the condensate can flow to the liquid drainage plane on the top surface of the bottom cover through the liquid drainage inclined plane on the top surface of the bottom cover, and then the condensate is discharged from the marine ventilation system through the liquid drainage holes on the liquid drainage plane. Moreover, since the liquid drainage holes are always open, the condensate can be discharged in real time through the bottom cover, so that water will not accumulate in the marine pipeline cover, causing the problem of corrosion of the marine pipeline cover, thereby prolonging the service life of the marine pipeline cover. Brief Description of the Drawings

[0027] Figure 1 is an axonometric view of the marine pipeline cover provided by the utility model;

[0028] Figure 2 is a top view of the marine pipeline cover provided by the utility model;

[0029] Figure 3 is a front view of the marine pipeline cover provided by the utility model;

[0030] Figure 4 is an axonometric view of the flange of the marine pipeline cover provided by the utility model.

[0031] In the figure:

[0032] 1. Connecting pipe; 11. Pipe body; 12. Flange; 121. First connecting part; 122. Second connecting part; 1211. First mounting hole;

[0033] 2. Bottom cover; 21. Liquid drainage plate; 22. Deflector plate; 211. Liquid drainage plane; 212. Liquid drainage hole; 221. Deflecting inclined plane. Detailed Embodiment

[0034] To make the technical problems solved by the utility model, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the present invention will be further described below with reference to the drawings and through specific embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that only the parts related to the present invention are shown in the drawings for the convenience of description, rather than all of them.

[0035] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0037] In the description of this embodiment, the orientation or positional relationships such as "up", "down", "left", and "right" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0038] The technical solution of the present utility model will be further described below with reference to the drawings and through specific embodiments.

[0039] Such as Figure 1-2As shown in the figure, this embodiment provides a marine pipeline cover, which includes a connecting pipe 1 and a bottom cover 2. One end of the connecting pipe 1 is used to connect to the marine ventilation pipeline, and the other end of the connecting pipe 1 is connected to the bottom cover 2. The bottom cover 2 is used to block this end, forming a closed end cover to receive the condensate water of the marine ventilation system. The top surface of the bottom cover 2 includes a liquid drainage plane 211 and a diversion inclined plane 221. The bottom end of the diversion inclined plane 221 is connected to the liquid drainage plane 211, and a liquid drainage hole 212 is provided on the liquid drainage plane 211. With the above settings, the condensate water flowing from the ventilation system to the pipeline cover flows through the diversion inclined plane 221 to the liquid drainage plane 211, and finally is discharged from the bottom cover through the liquid drainage hole 212 on the liquid drainage plane 211, realizing real-time condensation water discharge in real time. Since the liquid drainage hole 212 is always open, the condensate water can be discharged in real time through the bottom cover 2, and there will be no problem that water accumulates in the marine pipeline cover and causes the marine pipeline cover to be corroded, thereby extending the service life of the marine pipeline cover.

[0040] Specifically, the material of the marine ventilation pipeline can be fiberglass, PVC high-strength flame-retardant fireproof cloth or galvanized steel plate stainless steel material. In this embodiment, the material of the marine ventilation pipe is galvanized steel, which is used to resist harsh working conditions. Since the wall thickness of the galvanized steel plate is relatively thin, it can also be used to reduce the weight of the hull, and thus can carry more goods.

[0041] Specifically, the material of the pipeline cover can be fiberglass, PVC high-strength flame-retardant fireproof cloth or galvanized steel plate stainless steel material. To match the ventilation pipeline and also to save money, materials and working hours, in this embodiment, the material of the pipeline cover is galvanized steel.

[0042] Optionally, the thickness of the marine ventilation pipeline and the marine pipeline cover can be selected from 1.2 - 1.7 mm. If the steel plate thickness is too thin, it is easy to not withstand harsh working conditions, thereby affecting the service life of the marine ventilation pipeline and the marine pipeline cover. If the steel plate thickness is too thick, its rolling and processing will become extremely difficult. Therefore, the thickness of the marine ventilation pipeline and the marine pipeline cover is selected from 1.2 - 1.7 mm. Exemplarily, the thickness of the marine ventilation pipeline and the marine pipeline cover can be 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm and 1.7 mm. In this embodiment, the marine ventilation pipe and the bottom cover plate both use galvanized steel plates with a wall thickness of 1.5 mm, which can reduce the processing difficulty while having relatively high strength to resist harsh working conditions, and can also save costs and the empty ship weight.

[0043] Optionally, as Figure 2As shown, since the ship will sway during navigation, setting the drainage plane 211 to have a certain dimension along the radial direction of the connecting pipe 1 can allow the condensed water to flow irregularly on the drainage plane 211 and randomly drain through the drainage holes 212, thereby draining the condensed water remaining on the drainage plane 211. However, if the maximum dimension of the drainage plane 211 along the radial direction of the connecting pipe 1 is too large or too small, it will affect the drainage capacity of the drainage plane 211. Therefore, the maximum dimension of the drainage plane 211 along the radial direction of the connecting pipe 1 should not be too large. When the maximum dimension of the drainage plane 211 along the radial direction of the connecting pipe 1 is greater than 60 mm, due to the large proportion of the middle plane of the top surface of the bottom cover 2, it is easy to accumulate water on the plane, making the condensed water on the plane unable to drain. The maximum dimension of the drainage plane 211 along the radial direction of the connecting pipe 1 should not be too small. When the maximum dimension of the drainage plane 211 along the radial direction of the connecting pipe 1 is less than 40 mm, due to the large proportion of the middle inclined plane of the top surface of the bottom cover 2, the range where the inclined plane directly forms a fold angle with the pipe wall will become larger. Since there is no plane connection at the fold angle, it is very easy to accumulate condensed water at the fold angle, thereby corroding the connecting pipe 1 and the bottom cover 2. Therefore, the maximum dimension of the drainage plane 211 along the radial direction of the connecting pipe 1 is 40 - 60 mm. Exemplarily, the maximum dimension of the drainage plane 211 along the radial direction of the connecting pipe 1 can be 40 mm, 45 mm, 50 mm, 55 mm, and 60 mm. To better drain the condensed water in real time, in this embodiment, the maximum dimension of the drainage plane 211 along the radial direction of the connecting pipe 1 is 50 mm.

[0044] Optionally, as Figure 2 shown, the diameter of the drainage hole 212 is 5 - 13 mm. The size of the drainage hole 212 should not be too large. If the size of the drainage hole 212 is too large, external air will diffuse into the ventilation system through the drainage hole 212 and affect the ventilation system. If the size of the drainage hole 212 is too small, the internal condensed water cannot drain smoothly from the smaller drainage hole 212, which will cause water accumulation in the pipe cap, thereby corroding the inner wall of the pipe cap. Exemplarily, the diameter of the drainage hole 212 can be 5 mm, 7 mm, 9 mm, 11 mm, and 13 mm. To make the bottom cover 2 have a better drainage effect, in this embodiment, the diameter of the drainage hole 212 is 10 mm. Setting the diameter of the drainage hole 212 to 10 mm not only avoids the influence on the ventilation system due to the too large size of the drainage hole 212, but also avoids the corrosion of the pipe cap caused by water accumulation due to the too small size.

[0045] Optionally, as Figure 2As shown, at least two drain holes 212 are provided on the drainage plane 211. The number of drain holes 212 should not be too small. If only one drain hole 212 is provided, the condensed water can only be discharged from this hole, which will accumulate the condensed water and corrode the pipe cover. Nor should it be too many, which will cause structural redundancy and may also cause air to flow back into the marine ventilation duct, affecting the marine ventilation system. To avoid these two situations, in this embodiment, three drain holes 212 are provided on the drainage plane 211 to discharge the condensed water.

[0046] Optionally, the connection mode between the connecting pipe 1 and the bottom cover 2 can be welding, riveting, and bonding with glue. Since galvanized steel plates are selected in this embodiment, welding will damage the galvanized layer of the galvanized steel plate. Therefore, as Figure 1-3 shown, in this embodiment, the connecting pipe 1 includes a pipe body 11 and a first outwardly turned plate. The first outwardly turned plate is connected to one axial end of the pipe body 11, and the first outwardly turned plate extends radially outward of the pipe body 11. The bottom cover 2 includes a bottom plate. The bottom plate is located below the first outwardly turned plate. The edge of the bottom plate is bent to form an inwardly turned plate, and the inwardly turned plate is located above the first outwardly turned plate and is riveted and fixed to the first outwardly turned plate. With the above settings, the damage to the galvanized layer caused by welding can be avoided. At the same time, since it is formed by folding the two connecting parts respectively and then overlapping them, it is more firm than the direct connection method.

[0047] Furthermore, as Figure 3 shown, the bottom plate includes a diversion plate 22 and a drainage plate 21. A diversion slope 221 is provided on the diversion plate 22 to enable the condensed water to flow smoothly into the drainage plane 211 provided on the drainage plate 21, and then the condensed water is discharged in real time through the drain holes 212 provided on the drainage plate 21. To enable this marine cover to withstand harsh working conditions, in this embodiment, the bottom plate is a galvanized steel plate with a uniform thickness. The galvanized steel plate with a uniform thickness also has the advantages of optimizing the processing ability and being not easily deformed during processing.

[0048] Optionally, the connection mode between the diversion plate 22 and the drainage plate 21 forming the bottom plate can be welding connection, bonding with glue, or integral molding. To make the connection between the diversion plate 22 and the drainage plate 21 more tight and not easily break, in this embodiment, the bottom plate is a galvanized steel plate pressed into a specific shape and then formed by the sheet metal bending processing method. The above bottom plate forming method is not only simple but also easy to process. Since the bottom plate is obtained by sheet metal bending processing, the connection between the diversion plate 22 and the drainage plate 21 is also more tight.

[0049] Furthermore, as Figure 4As shown in the figure, the flange 12 includes a first connecting portion 121. The first connecting portion 121 is tubular. One axial end of the first connecting portion 121 is turned outward to form a second connecting portion 122. The first connecting portion 121 is nested with the pipe body 11. The first connecting portion 121 is used to connect with the pipe body 11, and the second connecting portion 122 is used to connect with the marine ventilation duct. Thus, the marine ventilation duct is hermetically connected to the marine pipe cover, enabling the condensed water formed in the marine ventilation duct to smoothly flow into the marine pipe cover and be discharged from the marine pipe cover smoothly.

[0050] Specifically, as Figure 4 shown, the first connecting portion 121 is provided with first mounting holes 1211. The distance between each adjacent pair of first mounting holes 1211 is equal. The pipe body 11 is connected to the first connecting portion 121 through the first mounting holes 1211. The second connecting portion 122 is provided with second mounting holes. The distance between each adjacent pair of second mounting holes is equal. The marine ventilation duct is connected to the first connecting portion 121 through the second mounting holes. In this embodiment, to make the connection between the marine pipe cover and the marine ventilation duct more tight, the second mounting holes are paired and drilled according to the drilling standard of the flange of the marine ventilation duct, and the first mounting holes 1211 are drilled at the corresponding positions of the second mounting holes.

[0051] Optionally, the flange 12 and the pipe body 11 can be connected by bolts and nuts, pin connections, and riveting. To make the connection between the flange 12 and the pipe body 11 more firm, in this embodiment, the flange 12 and the pipe body 11 are riveted at the opening positions of the first mounting holes 1211. Where riveting is not convenient, welding can be used for connection and fixation, and slag removal and paint repair are done at the welding parts.

[0052] Specifically, to make the use effect of the marine pipe cover better and, more importantly, to avoid the risk of air leakage and liquid leakage, sealing members are provided at the connection between the flange 12 and the pipe body 11 and at the connection between the pipe body 11 and the bottom cover 2 for sealing the connections, making the use effect of the marine pipe cover better and also extending the service life of the marine pipe cover.

[0053] More specifically, in this embodiment, to make the pipe cover have a better use effect, the pipe body 11 is sleeved outside the flange 12. A sealing member is provided at the abutting portion between the pipe body 11 and the second connecting portion 122 for sealing it. A sealing member is provided in the space formed by the end of the first connecting portion 121 away from the second connecting portion 122 and the inner wall of the pipe body 11. To protect the sealing member from corrosion, the surface of the position where the sealing member is provided is wrapped with aluminum foil tape.

[0054] Optionally, in this embodiment, the seal is selected as a flame-retardant glue, which can not only seal the connection between the pipe body 11 and the flange 12 and the connection between the pipe body 11 and the bottom cover 2, but also prevent the spread of fire in case of a fire, protecting the materials and structures at the connections from damage. In other embodiments, the seal can be silicone sealant, polyurethane sealant, polyurethane silicone sealant, etc., as long as it can seal the connection.

[0055] This embodiment also provides a marine ventilation system. The marine ventilation duct is provided with an air inlet, a ventilation opening and a drain opening. The drain opening is connected to the marine pipe cover, and the pipe opening of the connecting pipe connected to the bottom cover is arranged downward, so as to solve the problem of untimely condensate discharge in the marine ventilation system and extend the service life of the marine ventilation system.

[0056] Specifically, in this embodiment, the marine ventilation system is used to cool the temperature of the cargo hold, including a marine ventilation duct and a marine pipe cover. The upper end of the ventilation duct is the air inlet, and the lower end is connected to the pipe cover. Moreover, a plurality of ventilation openings are arranged at intervals along the axial direction on the outer peripheral surface of the ventilation duct. When the cargo hold needs to control the ambient temperature, the marine ventilation system will suck in air through the air inlet, cool the air, and then blow the cold air into the corresponding cargo hold through the spaced ventilation openings to adjust the temperature of the cargo hold. When cooling the air, condensed water will be generated after excessive cooling and liquefaction. The condensed water will be discharged from the marine ventilation system in real time through the bottom cover.

[0057] Optionally, the ventilation duct can be a steel circular air duct or a galvanized steel spiral air duct. Due to the advantages of light weight, high strength, small resistance, and small air volume loss of the spiral air duct, it has been more and more widely used in marine ventilation systems. In this embodiment, the marine ventilation duct is a spiral air duct, which is made of thin-walled galvanized steel sheets. The spiral air duct does not require painting, and the galvanized layer has a smooth surface and an anti-rust oil layer, which has a lubricating and anti-oxidation effect.

[0058] This embodiment also provides a ship. A cargo hold is arranged inside the ship's hull, and the ventilation opening is arranged inside the cargo hold, so as to solve the problem of reducing the temperature of the cargo hold where containers are placed and avoid irreversible damage to the ship caused by too high temperature in the cargo hold.

[0059] Specifically, in this embodiment, the ship includes a hull, containers and a marine ventilation system. A cargo hold is arranged inside the ship's hull, and the containers are arranged inside the cargo hold. Since the containers often contain items that need to be refrigerated, a large amount of heat will be released when the containers cool the items inside, causing the temperature of the cargo hold to rise. If the temperature of the cargo hold is too high, it will cause irreversible damage to the hull. Therefore, the ventilation duct is arranged inside the cargo hold, and the ventilation opening faces the containers to dissipate heat from the containers, so as to avoid damage to the hull.

[0060] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A marine pipeline cover, characterized in that: include: A connecting pipe (1), wherein one end of the connecting pipe (1) is used for connecting to a marine ventilation duct; A bottom cover (2) is connected to the connecting pipe (1) to block the other end of the connecting pipe (1); the top surface of the bottom cover (2) comprises a liquid discharge plane (211) and a flow guiding inclined surface (221); the bottom end of the flow guiding inclined surface (221) is connected to the liquid discharge plane (211); and a liquid discharge hole (212) is provided on the liquid discharge plane (211).

2. The marine pipeline cover according to claim 1, characterized in that: The maximum dimension of the liquid discharge plane (211) along the radial direction of the connecting pipe (1) is 40-60 mm; And / or, the diameter of the drainage hole (212) is 5-13 mm.

3. The marine pipeline cover according to claim 1, characterized in that: The connecting pipe (1) comprises a pipe body (11) and a first outer flap, wherein the first outer flap is connected to one axial end of the pipe body (11) and extends toward the outside of the pipe body (11) along the radial direction of the pipe body (11); The bottom cover (2) comprises a bottom plate, the bottom plate is located below the first outer flap, the edge of the bottom plate is bent to form an inner flap, the inner flap is located above the first outer flap and is riveted and fixed to the first outer flap.

4. The marine pipeline cover according to claim 3, characterized in that: The bottom plate comprises a guide plate (22) and a liquid drainage plate (21); the guide plate (22) is provided with the guide slope (221); and the liquid drainage plate (21) is provided with the liquid drainage plane (211).

5. The marine pipeline cover according to any one of claims 1 to 4, characterized in that: The connecting pipe (1) comprises a pipe body (11) and a flange (12); the flange (12) is connected to one end of the pipe body (11); and the flange (12) is used to connect to the marine ventilation duct.

6. The marine pipeline cover according to claim 5, characterized in that: The flange (12) comprises a first connecting portion (121), and the first connecting portion (121) is tubular; One axial end of the first connecting portion (121) is folded outward to form a second connecting portion (122); The first connection part (121) is nested with the tube body (11), the first connection part (121) is connected to the tube body (11), and the second connection part (122) is used to be connected to the marine ventilation duct.

7. The marine pipeline cover according to claim 6, characterized in that: The first connecting portion (121) and the tube body (11) are fixed by means of rivets.

8. The marine pipeline cover according to claim 5, characterized in that: The connection between the flange (12) and the tube body (11), and the connection between the tube body (11) and the bottom cover (2) are both provided with sealing members.

9. A marine ventilation system, characterized in that: The invention comprises a marine ventilation duct and a marine duct cover as claimed in any one of claims 1 to 8, wherein the marine ventilation duct is provided with an air inlet, a vent and a drain, the drain is connected to the marine duct cover, and the pipe opening of the connecting pipe (1) connected to the bottom cover (2) is arranged downward.

10. A ship, characterized in that: It comprises a hull and a marine ventilation system as claimed in claim 9, wherein a cargo hold is arranged in the hull, and the ventilation port is arranged in the cargo hold.

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