Air-permeable cargo deck for ship

Abstract

The utility model provides an air-permeable cargo deck for a ship. The air-permeable cargo deck is suitable for a semi-submerged ship. The semi-submerged ship comprises a ship body, a cargo carrying deck, a forecastle, a plurality of ballast tanks, a plurality of ballast pumps, a plurality of transverse bulkheads and a ventilation system, the ballast tanks are arranged in the ship body, the transverse bulkheads are arranged among the ballast tanks, and the ballast pumps are arranged in the ballast tanks; the cargo deck is arranged on the upper side of the ballast tank, and the forecastle is arranged at one end of the cargo deck; the ventilation system penetrates through the transverse bulkhead and the first building to enable the ballast tanks to be communicated with outside air. The ventilation tunnel has good flexibility, the position relation between the cargo deck and the ballast tank is fully utilized, the structural form is reasonably designed, finally, the ventilation tunnel is integrated into the cargo deck, a traditional complex ventilation pipeline system is omitted, and due to the fact that the ventilation tunnel is closer to the top of the ballast tank, the effective tank capacity of the ballast tank is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ships and marine engineering, in particular to a cargo deck with air permeability used on ships. Background Art

[0002] Ships are used to undertake the task of maritime cargo transportation, including semi-submersible ships. Semi-submersible ships have obvious external features, that is, they have a large cargo deck. Usually, a forecastle is set at the bow of the ship, and several ballast tanks and ballast pumps are set. The ballast pumps are used to fill and drain water to achieve the sinking and floating of the semi-submersible ship. This configuration can maintain the stability and balance of the hull to a certain extent. When it is necessary to load cargo, the cargo deck is sunk or floated to the same level as the dock through ballast tanks and ballast pumps. When the cargo deck is submerged in the water, the bow of the ship remains above the water, which can better command and dispatch, so as to move the specific cargo to be carried from the designated location to the cargo deck.

[0003] The ventilation system of traditional semi-submersible vessels is mainly used for ventilation of ballast tanks during ballast filling and drainage operations, such as Figure 1 , Figure 2 As shown, a vent pipe 5 is usually arranged from the top of each ballast tank 4, through each transverse bulkhead 7 to the forecastle 3, and vertically extends upward from the forecastle 3 to the open deck, and a vent pipe head 8 is arranged at the end. When the vent pipe 5 passes through the transverse bulkhead 7, it is connected with a tank through piece 6, but the vent system of a conventional semi-submersible vessel has certain limitations, as follows:

[0004] like Figure 1-Figure 3 As shown, this traditional ventilation system requires the installation of a large number of ventilation pipes 5 (mostly steel pipes, but also non-metallic materials). Since the ventilation pipes 5 of semi-submersible vessels are usually large in diameter and long in length, the ventilation pipes 5 themselves are heavy. The ventilation pipes 5 are usually connected by flanges (partially by sleeves or welding), and then installed upside down on the back of the cargo deck 2 through ventilation pipe hangers 501. The ventilation pipe 5 system is difficult to construct. The ventilation pipes 5 pass through each transverse bulkhead 7, which requires a relatively large opening, which greatly damages the strength of the hull. In addition, since the cargo deck 2 has a reverse reinforcement structure with a certain height (such as Figure 3 H 2 ) The ventilation pipeline 5 itself also has a certain height (such as Figure 3 H 3 ), so the overall height of the ventilation pipe 5 system is H 1 =H 2 +H 3 , for a semi-submersible vessel, H 1 The height is very large, which to some extent weakens the efficient utilization of the capacity of the ballast tank 4. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a breathable cargo deck for ships, so as to solve the defects existing in the ventilation system of the above-mentioned traditional semi-submersible ships.

[0006] To achieve the above-mentioned object, the utility model provides a breathable cargo deck for ships, which is suitable for semi-submersible ships; the semi-submersible ship comprises a hull, a cargo deck, a forecastle, a plurality of ballast tanks, a plurality of ballast pumps, a plurality of transverse bulkheads, and a ventilation system, wherein the ballast tanks are arranged in the hull, the transverse bulkheads are arranged between the ballast tanks, and the ballast pumps are arranged in the ballast tanks; the cargo deck is arranged on the upper side of the ballast tanks, and the forecastle is arranged at one end of the cargo deck; the ventilation system penetrates the transverse bulkheads and the forecastle to connect the plurality of ballast tanks with the outside air; The cargo deck includes an upper deck, a lower deck, and a plurality of connecting plates, and the upper deck and the lower deck are fixedly connected by the connecting plates; the ventilation system includes a plurality of ventilation tunnels and a plurality of ventilation pipe heads, the upper deck is the top plate of the ventilation tunnel, the lower deck is the bottom plate of the ventilation tunnel, and the connecting plates are the side plates of the ventilation tunnel; one end of the ventilation tunnel is arranged in the ballast tank, and a ventilation hole is opened on the bottom plate of the end of the ventilation tunnel, and the other end of the ventilation tunnel is arranged in the forecastle and is connected to the ventilation pipe head; the ventilation tunnel runs through a plurality of transverse bulkheads.

[0007] Preferably, the ballast tanks are in four groups, namely, a first group of ballast tanks, a second group of ballast tanks, a third group of ballast tanks, and a fourth group of ballast tanks; the number of the transverse bulkheads is four, namely, a first transverse bulkhead, a second transverse bulkhead, a third transverse bulkhead, and a fourth transverse bulkhead, the first transverse bulkhead is arranged between the first group of ballast tanks and the second group of ballast tanks, the second transverse bulkhead is arranged between the second group of ballast tanks and the third group of ballast tanks, the third transverse bulkhead is arranged between the third group of ballast tanks and the fourth group of ballast tanks, and the fourth transverse bulkhead is arranged between the fourth group of ballast tanks and the forecastle.

[0008] Preferably, the number of ballast tanks in each group is two, and they are symmetrically distributed on the left and right sides of the hull; the ballast tanks are grouped in pairs, and the number of ballast tanks is eight, namely, the first group of left ballast tanks, the first group of right ballast tanks, the second group of left ballast tanks, the second group of right ballast tanks, the third group of left ballast tanks, the third group of right ballast tanks, the fourth group of left ballast tanks, and the fourth group of right ballast tanks; the number of air tunnels in each of the ballast tanks is two, and the ends of the two air tunnels away from the forecastle are respectively arranged at the front end and the rear end of the ballast tank.

[0009] Preferably, a breathable tunnel passage piece is also provided in the transverse bulkhead, and the breathable tunnel passage piece includes a breathable tunnel opening type passage piece and a breathable tunnel watertight passage piece. The breathable tunnel opening type passage piece is connected to the breathable tunnel to ensure the smooth flow of the breathable tunnel; the breathable tunnel watertight passage piece is connected to the breathable tunnel to ensure the closure of the breathable tunnel.

[0010] Preferably, the air-permeable tunnel opening type chamber member is provided with a through hole for unobstructed air tunnel; and a plurality of water flow holes are provided on the bottom surface of the air-permeable tunnel opening type chamber member in a vertical direction for draining water on the air-permeable tunnel opening type chamber member.

[0011] Preferably, the through hole area on the air-permeable tunnel opening type chamber member is not less than 1.25 times the flow area of ​​the ballast pump pipeline.

[0012] Preferably, the air vent is connected to a vent pipe extending toward the bottom of the ballast tank.

[0013] As described above, the breathable cargo deck used on a ship according to the utility model has the following beneficial effects:

[0014] 1. The utility model relates to a breathable cargo deck for ships, which abandons the pipe design of steel pipes (or non-metallic materials) in the ventilation system in the traditional process, and divides the cargo deck into an upper deck and a lower deck. The upper deck, the lower deck, and the connecting plate constitute a ventilation tunnel. Compared with the complicated pipes (steel pipes, connecting flanges, connecting bolts, through-tank parts, etc.) in the traditional process, the structure is simpler. At the same time, the cargo deck has an upper deck, a lower deck, and a connecting plate, which further enhances the structural strength of the cargo deck and improves the carrying capacity of the cargo deck.

[0015] 2. The utility model has good flexibility, makes full use of the positional relationship between the cargo deck and the ballast tank, reasonably designs the structural form, and finally integrates the ventilation tunnel into the cargo deck, eliminating the traditional complex ventilation pipeline system. In addition, since the ventilation tunnel is closer to the top of the ballast tank, the effective capacity of the ballast tank is improved.

[0016] 3. The breathable cargo deck for ships involved in the utility model is composed of a common steel structure and a small amount of pipelines (the pipelines are mainly used to install breathable pipe heads). It is easy to process and manufacture in a shipyard and has flexible layout. It simplifies the traditional breathable pipeline system, improves the carrying capacity of the cargo deck, and has an economical production cost. It has better application effects, strong operability, and good promotion prospects, especially on medium and large semi-submersible ships. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front view of the venting pipeline on the conventional semi-submersible vessel of the utility model;

[0018] Figure 2 It is a top view of the ventilation pipeline on the conventional semi-submersible vessel of the utility model;

[0019] Figure 3 It is a cross-sectional view of the venting pipeline on the conventional semi-submersible vessel of the utility model;

[0020] Figure 4 This is a first angle general layout diagram of a breathable cargo deck for ships involved in the utility model;

[0021] Figure 5 This is a second angle general layout diagram of the breathable cargo deck on a ship involved in the utility model;

[0022] Figure 6 It is a schematic diagram of a ventilation tunnel for a breathable cargo deck on a ship involved in the utility model;

[0023] Figure 7 It is a structural schematic diagram of the air-permeable tunnel opening type cabin member in the utility model;

[0024] Figure 8 It is a structural schematic diagram of a watertight through-cabin component of a breathable tunnel in the utility model.

[0025] Description of reference numerals:

[0026] 1. Hull; 2. Cargo deck; 201. Upper deck; 202. Lower deck; 203. Connecting plate; 204. Ventilation tunnel opening type through-tank; 205. Ventilation tunnel watertight type through-tank; 206. Ventilation hole; 3. Forecastle; 4. Ballast tanks; 401. First group of right ballast tanks; 402. First group of left ballast tanks; 403. Second group of right ballast tanks; 404. Second group of left ballast tanks; 405. Third group of right ballast tanks Cargo tank; 406, third group of left ballast tank; 407, fourth group of right ballast tank; 408, fourth group of left ballast tank; 5, ventilation pipe; 501, ventilation pipe hanger; 6, tank through-piece; 7, transverse bulkhead; 701, first transverse bulkhead; 702, second transverse bulkhead; 703, third transverse bulkhead; 704, fourth transverse bulkhead; 8, ventilation pipe head; 9, ventilation tunnel; 901, first ventilation tunnel; 902, second ventilation tunnel. DETAILED DESCRIPTION

[0027] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0028] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0029] The utility model provides a breathable cargo deck for ships. For the convenience of description, the end of the hull 1 away from the forecastle 3 is defined as the rear end, and the end of the hull 1 close to the forecastle 3 is defined as the front end. Figure 4 The left direction and the right direction of the paper are the rear direction and the front direction respectively, the upper direction and the lower direction of the paper are the upper direction and the lower direction respectively, and the front side and the back side of the paper are the right direction and the left direction respectively.

[0030] like Figure 4-Figure 8 As shown, the utility model provides a cargo deck with air permeability for ships, which is suitable for semi-submersible ships; the semi-submersible ship comprises a hull 1, a cargo deck 2, a forecastle 3, a plurality of ballast tanks 4, a plurality of ballast pumps, a plurality of transverse bulkheads 7, and a ventilation system, the ballast tanks 4 are arranged in the hull 1, the transverse bulkheads 7 are arranged between the ballast tanks 4, and the ballast pumps are arranged in the ballast tanks 4; the cargo deck 2 is arranged on the upper side of the ballast tanks 4, and the forecastle 3 is arranged at the front end of the cargo deck 2; the ventilation system penetrates the transverse bulkheads 7 and the forecastle 3 to connect the plurality of ballast tanks 4 with the outside air; the cargo deck 2 comprises an upper deck 201, a lower deck 202, and a lower deck 203. The deck 202 and several connecting plates 203, the upper deck 201 and the lower deck 202 are fixedly connected by the connecting plates 203; the ventilation system includes several ventilation tunnels 9 and several ventilation pipe heads 8, the upper deck 201 is the top plate of the ventilation tunnel 9, the lower deck 202 is the bottom plate of the ventilation tunnel 9, and the connecting plates 203 are the side plates of the ventilation tunnel 9; the rear end of the ventilation tunnel 9 is arranged in the ballast tank 4, and the bottom plate at the rear end of the ventilation tunnel 9 is provided with ventilation holes 206, the front end of the ventilation tunnel 9 is arranged in the forecastle 3, and is connected with the ventilation pipe head 8; the ventilation tunnel 9 runs through several transverse bulkheads 7.

[0031] The ventilation system in the utility model is composed of a plurality of ventilation tunnels 9, and the cargo deck 2 includes an upper deck 201, a lower deck 202, and a plurality of connecting plates 203. The upper deck 201, the lower deck 202, and the connecting plates 203 constitute the ventilation tunnel 9, which abandons the traditional method of using ventilation pipelines 5, has a simple structure and low cost, and at the same time, because the ventilation tunnel 9 is closer to the top of the ballast tank 4, the effective capacity of the ballast tank 4 can be improved. The cargo deck 2 is composed of the upper deck 201, the lower deck 202, and the connecting plates 203, which further enhances the structural strength of the cargo deck 2 and improves the carrying capacity of the cargo deck 2.

[0032] Preferably, Figure 5 As shown, in this embodiment, there are four groups of ballast tanks 4, which are the first group of ballast tanks, the second group of ballast tanks, the third group of ballast tanks, and the fourth group of ballast tanks from the rear end to the front end of the hull 1; there are four transverse bulkheads 7, which are the first transverse bulkhead 701, the second transverse bulkhead 702, the third transverse bulkhead 703, and the fourth transverse bulkhead 704 from the rear end to the front end of the hull 1, the first transverse bulkhead 701 is arranged between the first group of ballast tanks and the second group of ballast tanks, the second transverse bulkhead 702 is arranged between the second group of ballast tanks and the third group of ballast tanks, the third transverse bulkhead 703 is arranged between the third group of ballast tanks and the fourth group of ballast tanks, and the fourth transverse bulkhead 704 is arranged between the fourth group of ballast tanks and the forecastle 3.

[0033] Further, such as Figure 5 As shown, the number of each group of ballast tanks 4 is two, and they are symmetrically distributed on the left and right sides of the hull 1; the ballast tanks 4 are grouped in pairs, and the number of ballast tanks 4 is eight in total, namely, the first group of left ballast tanks 402, the first group of right ballast tanks 401, the second group of left ballast tanks 404, the second group of right ballast tanks 403, the third group of left ballast tanks 406, the third group of right ballast tanks 405, the fourth group of left ballast tanks 408, and the fourth group of right ballast tanks 407; the number of air-permeable tunnels 9 in each ballast tank 4 is two, and the front ends of the two air-permeable tunnels 9 are respectively arranged at the front end and the rear end of the ballast tank 4. Further, in this embodiment, each group of ballast tanks 4 is symmetrically distributed on the left and right sides of the hull 1, and each ballast tank 4 has two air-permeable tunnels 9, so the number of air-permeable tunnels 9 is sixteen in total.

[0034] Preferably, Figure 5-Figure 8 As shown, a ventilation tunnel passage is also provided in the transverse bulkhead 7, and the ventilation tunnel passage comprises a ventilation tunnel opening passage 204 and a ventilation tunnel watertight passage 205. The ventilation tunnel opening passage 204 is connected to the ventilation tunnel 9 to ensure the smooth flow of the ventilation tunnel 9; the ventilation tunnel watertight passage 205 is connected to the ventilation tunnel 9 to ensure the sealing of the ventilation tunnel 9. In this embodiment, as shown in FIG. Figure 5As shown in the figure, the dotted lines of the first transverse bulkhead 701, the second transverse bulkhead 702, the third transverse bulkhead 703, and the fourth transverse bulkhead 704 indicate the position of the air-permeable tunnel opening type through-tank member 204, and the solid lines indicate the position of the air-permeable tunnel watertight through-tank member 205. The air-permeable tunnels 9 in the front and rear ballast tanks 4 are connected or closed by the air-permeable tunnel through-tank member, and the air-permeable tunnel through-tank member is arranged in the transverse bulkhead 7, and will not open a hole on the transverse bulkhead 7 to penetrate the air-permeable tunnel 9 as in the prior art, thereby causing structural damage to the hull 1.

[0035] Further, such as Figure 7 As shown, a through hole is provided on the air-permeable tunnel opening type chamber member 204 for unobstructed air tunnel 9; a plurality of water flow holes (not shown) are provided on the bottom surface of the air-permeable tunnel opening type chamber member 204 in the vertical direction for draining water on the air-permeable tunnel opening type chamber member 204.

[0036] Preferably, the through hole area of ​​the air-permeable tunnel opening type chamber member 204 is not less than 1.25 times the flow area of ​​the ballast pump pipeline; in this embodiment, the through hole area of ​​the air-permeable tunnel opening type chamber member 204 is limited to meet the flow area of ​​the air-permeable tunnel 9. In other embodiments, the air-permeable tunnel opening type chamber member 204 can adopt a verified structural form on the basis of ensuring the opening area to achieve the best structural strength.

[0037] Preferably, the air vent 206 is connected with an air vent pipe extending toward the bottom of the ballast tank 4, so as to meet the top air cushion requirement of the ballast tank 4 of the semi-submersible vessel.

[0038] The utility model relates to a breathable cargo deck for ships. Taking the first group of right ballast tanks 401 as an example, the working principle is described as follows:

[0039] Two ventilation tunnels 9 are arranged in the cargo deck 2 on the top of the first right ballast tank 401 of the hull 1, namely the first ventilation tunnel 901 and the second ventilation tunnel 902. The rear end of the first ventilation tunnel 901 is arranged at the rear end of the first right ballast tank 401, and the rear end of the second ventilation tunnel 902 is arranged at the front end of the first right ballast tank 401. Figure 5 As shown, the length of the first ventilation tunnel 901 is greater than that of the second ventilation tunnel 902. A ventilation hole A is provided on the bottom plate at the rear end of the first ventilation tunnel 901 (i.e., the lower deck 202), and a ventilation hole B is provided on the bottom plate at the rear end of the second ventilation tunnel 902 (i.e., the lower deck 202).

[0040] When the ballast pump pumps water into the first right ballast tank 401, the gas in the first right ballast tank 401 enters the ventilation tunnel 9 through the ventilation holes A and B, and then enters the forecastle 3 through the ventilation tunnel opening type through-tank parts 204 at the first transverse bulkhead 701, the ventilation tunnel opening type through-tank parts 204 at the second transverse bulkhead 702, the ventilation tunnel opening type through-tank parts 204 at the third transverse bulkhead 703, and the ventilation tunnel opening type through-tank parts 204 at the fourth transverse bulkhead 704, and then escapes to the outside environment through the ventilation pipe head 8. Correspondingly, the same operation is performed in the remaining ballast tanks 4. At this time, seawater enters the ballast tanks 4, and the hull 1 sinks, which is convenient for personnel to load cargo onto the cargo deck 2.

[0041] When the ballast pump pumps out the seawater in the ballast tank 4, the air enters the first vent tunnel 901 and the second vent tunnel 902 through the vent pipe head 8, and the air passes through the vent tunnel opening type through-tank member 204 at the fourth transverse bulkhead 704, the vent tunnel opening type through-tank member 204 at the third transverse bulkhead 703, the vent tunnel opening type through-tank member 204 at the second transverse bulkhead 702, and the vent tunnel opening type through-tank member 204 at the first transverse bulkhead 701, and enters the first group of right ballast tanks 401 through the vent holes A and the vent holes B. Correspondingly, the same operation is performed in the remaining ballast tanks 4, at which time the seawater in the ballast tanks 4 is discharged, and the hull 1 rises, which is convenient for the hull 1 to transport cargo.

[0042] The utility model relates to a breathable cargo deck for ships, which has good flexibility, makes full use of the positional relationship between the cargo deck 2 and the ballast tank 4, integrates the breathable tunnel 9 into the cargo deck 2, omits the complex breathable pipeline 5 system compared with the prior art, and because the breathable tunnel 9 is closer to the top of the ballast tank 4, the effective capacity of the ballast tank 4 can also be improved. The utility model has low production cost and strong operability, is particularly suitable for large semi-submersible ships, and has good promotion prospects.

[0043] In summary, the utility model effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0044] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A cargo deck with air permeability for use on a ship, suitable for use on a semi-submersible ship; the semi-submersible ship comprises a hull (1), a cargo deck (2), a forecastle (3), a plurality of ballast tanks (4), a plurality of ballast pumps, a plurality of transverse bulkheads (7), and a ventilation system, wherein the ballast tanks (4) are arranged in the hull (1), the transverse bulkheads (7) are arranged between the ballast tanks (4), and the ballast pumps are arranged in the ballast tanks (4); the cargo deck (2) is arranged on the upper side of the ballast tanks (4), and the forecastle (3) is arranged at one end of the cargo deck (2); the ventilation system penetrates the transverse bulkheads (7) and the forecastle (3) to connect the plurality of ballast tanks (4) with the outside air; and the characteristics are as follows: The cargo deck (2) comprises an upper deck (201), a lower deck (202), and a plurality of connecting plates (203), wherein the upper deck (201) and the lower deck (202) are fixedly connected via the connecting plates (203); the ventilation system comprises a plurality of ventilation tunnels (9) and a plurality of ventilation pipe heads (8), wherein the upper deck (201) is the top plate of the ventilation tunnel (9), the lower deck (202) is the bottom plate of the ventilation tunnel (9), and the connecting plates (203) are the side plates of the ventilation tunnel (9); one end of the ventilation tunnel (9) is arranged in the ballast tank (4), and a ventilation hole (206) is provided on the bottom plate of the end of the ventilation tunnel (9); the other end of the ventilation tunnel (9) is arranged in the forecastle (3) and is connected to the ventilation pipe head (8); the ventilation tunnel (9) passes through a plurality of transverse bulkheads (7).

2. The breathable cargo deck for ships according to claim 1, characterized in that: The ballast tanks (4) are four groups, namely the first group of ballast tanks, the second group of ballast tanks, the third group of ballast tanks, and the fourth group of ballast tanks; the number of the transverse bulkheads (7) is four, namely the first transverse bulkhead (701), the second transverse bulkhead (702), the third transverse bulkhead (703), and the fourth transverse bulkhead (704); the first transverse bulkhead (701) is arranged between the first group of ballast tanks and the second group of ballast tanks, the second transverse bulkhead (702) is arranged between the second group of ballast tanks and the third group of ballast tanks, the third transverse bulkhead (703) is arranged between the third group of ballast tanks and the fourth group of ballast tanks, and the fourth transverse bulkhead (704) is arranged between the fourth group of ballast tanks and the forecastle (3).

3. The breathable cargo deck for ships according to claim 2, characterized in that: The number of ballast tanks in each group is two and they are symmetrically distributed on the left and right sides of the hull (1); the ballast tanks (4) are grouped in pairs, and the number of ballast tanks (4) is eight, namely, a first group of left ballast tanks (402), a first group of right ballast tanks (401), a second group of left ballast tanks (404), a second group of right ballast tanks (403), a third group of left ballast tanks (406), a third group of right ballast tanks (405), a fourth group of left ballast tanks (408), and a fourth group of right ballast tanks (407); the number of air permeable tunnels (9) in each ballast tank (4) is two, and the ends of the two air permeable tunnels (9) away from the forecastle (3) are respectively arranged at the front end and the rear end of the ballast tank (4).

4. The breathable cargo deck for ships according to claim 1, characterized in that: A ventilation tunnel passage member is also provided in the transverse bulkhead (7), and the ventilation tunnel passage member comprises a ventilation tunnel opening type passage member (204) and a ventilation tunnel watertight passage member (205). The ventilation tunnel opening type passage member (204) is connected to the ventilation tunnel (9) to ensure the smooth flow of the ventilation tunnel (9); and the ventilation tunnel watertight passage member (205) is connected to the ventilation tunnel (9) to ensure the closure of the ventilation tunnel (9).

5. The breathable cargo deck for ships according to claim 4, characterized in that: The air-permeable tunnel hole-type through-chamber component (204) is provided with a through hole for unblocking the air-permeable tunnel (9); and a plurality of water flow holes are provided on the bottom surface of the air-permeable tunnel hole-type through-chamber component (204) in a vertical direction for draining water on the air-permeable tunnel hole-type through-chamber component (204).

6. The breathable cargo deck for ships according to claim 4, characterized in that: The through hole area on the air-permeable tunnel opening type through-chamber component (204) is not less than 1.25 times the flow area of ​​the ballast pump pipeline.

7. The breathable cargo deck for ships according to claim 1, characterized in that: The vent hole (206) is connected to a vent pipe extending toward the bottom of the ballast tank (4).

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