CN113335448A

CN113335448A - Marine drainage device

Info

Publication number: CN113335448A
Application number: CN202110732528.8A
Authority: CN
Inventors: 黄翔宇; 彭大轮; 卢志忠; 黄清华; 陶真; 关汝滔; 吉祥
Original assignee: CSSC Huangpu Wenchong Shipbuilding Co Ltd
Current assignee: CSSC Huangpu Wenchong Shipbuilding Co Ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-09-03
Anticipated expiration: 2041-06-29
Also published as: CN113335448B

Abstract

The invention relates to the technical field of ship construction, and discloses a marine drainage device which comprises a three-way pipe fixedly connected to a ship side plate, wherein the three-way pipe comprises a water outlet cavity positioned on the outer side of the ship side plate, a water guide cavity positioned above the water outlet cavity and a water suction cavity positioned on the inner side of the side wall of a ship side, a water collecting hopper is arranged above the three-way pipe, the bottom of the water collecting hopper is provided with an opening communicated with the upper end of the water guide cavity, the opening is detachably and hermetically connected with a plug, a driving part is connected to the plug, the plug is driven by the driving part to move upwards to open the opening, so that rainwater in the water collecting hopper enters the water guide cavity, then the plug is driven by the driving part to move downwards to be hermetically connected to the opening, the upper end of the water guide cavity is sealed, the water suction cavity and the water outlet cavity form a siphon channel, and the rainwater positioned in the water outlet cavity and the water guide cavity is under the action of gravity and atmospheric pressure, the accumulated water in the ship body is sucked into the water suction cavity and then flows out of the water outlet cavity.

Description

Marine drainage device

Technical Field

The invention relates to the technical field of ship construction, in particular to a marine drainage device.

Background

The ship is large in size, when the ship is manufactured in a segmented mode and carried in a dock, the ship is mostly located in an open-air environment, rainwater is often accumulated in a deck side area surrounded by a deck and side boards in rainy days, in order to prevent ship bodies from being rusted, the accumulated rainwater needs to be removed from the deck side area in time, a water suction pump is mostly adopted when the existing deck side area accumulated rainwater is removed, and a large amount of electric energy needs to be consumed when the water suction pump is used for extracting the rainwater in the deck side area.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: a water suction pump is mostly adopted when rainwater accumulated in the side area of the deck is removed, and a large amount of electric energy is consumed when the water suction pump is used for pumping the rainwater in the side area of the deck.

In order to solve the technical problem, the invention provides a marine drainage device, which comprises a three-way pipe fixedly connected to a ship side plate, wherein the three-way pipe comprises a water outlet cavity, a water guide cavity and a water suction cavity, the water outlet cavity is positioned on the outer side of the ship side plate and is provided with a downward opening, the water guide cavity is positioned above the water outlet cavity and is provided with an upward opening, the water suction cavity is positioned on the inner side of the ship side wall, the water outlet cavity, the water guide cavity and the water suction cavity are communicated with each other, and the lower end surface of the water outlet cavity is lower than the lower end surface of the water guide cavity;

a water collecting hopper is arranged above the three-way pipe, an opening is formed in the bottom of the water collecting hopper and communicated with the upper end of the water diversion cavity, and a plug is detachably and hermetically connected to the opening;

the plug is connected with a driving part, and the driving part drives the plug to move upwards so as to open the opening, so that rainwater in the water collecting hopper enters the water diversion cavity; or the driving component drives the plug to move downwards to close the opening, so that the water diversion cavity is sealed.

As a preferred scheme, the water collecting hopper is made of a metal magnetic material, and the lower end of the plug is magnetically adsorbed on the side wall of the opening;

preferably, the driving component comprises a first traction rope and a second traction rope, the first traction rope and the second traction rope are both connected with the plug, the length of the first traction rope is smaller than that of the second traction rope, a first floating piece is arranged at one end of the first traction rope, which is far away from the plug, and a second floating piece is arranged at one end of the second traction rope, which is far away from the plug;

the buoyancy of the first floating piece in water is larger than the gravity of the plug and smaller than the sum of the gravity of the plug and the magnetic adsorption force of the side wall of the opening to the plug; the sum of the buoyancy of the second floating piece and the buoyancy of the first floating piece in water is larger than the sum of the gravity of the plug and the magnetic adsorption force of the side wall of the opening to the plug.

Preferably, the plug comprises a plunger part arranged in the opening in a sliding mode and a flange part connected to the upper end of the plunger part, and soft magnetic strips are arranged on an annular surface, opposite to the opening, of the flange part.

Preferably, a plug guide structure is arranged in the water collecting hopper, a plug guide space is arranged on the plug guide structure in parallel with the axial direction of the opening, and the flange portion is arranged in the plug guide space in a vertically sliding manner.

Preferably, the plug is cylindrical, and the plug guide structure comprises a connecting ring and a plurality of guide columns arranged at intervals along the circumferential direction of the cylindrical plug;

the lower end of each guide post is fixedly connected to the bottom of the water collecting hopper, the upper end of each guide post is fixedly connected to the connecting ring, and the guide posts surround and form the plug guide space;

the diameter of the inner circle of the connecting ring is smaller than that of the plug.

Preferably, the water suction cavity comprises an arc part positioned at the upper part and a straight cylinder part positioned at the lower part, the middle of the arc part is high, the two ends of the arc part are low, the first end of the arc part is positioned at the outer side of the ship side plate, and the first end of the arc part is connected with the water outlet cavity;

the second end of circular arc portion is located ship board curb plate is inboard, the second end of circular arc portion is connected straight section of thick bamboo portion, straight section of thick bamboo portion downwardly extending to the bottom of ship board curb plate.

Preferably, the diameter of the water diversion cavity is larger than the diameter of the water outlet cavity and the diameter of the water suction cavity, a one-way valve is arranged at the upper end of the water suction cavity close to the water outlet cavity, and the opening direction of the one-way valve faces the water outlet cavity.

Preferably, the lower end of the water suction cavity is provided with a filtering part.

Preferably, the first floating part is a first plastic hollow floating ball, the second floating part is a second plastic hollow floating ball, and the diameter of the second plastic hollow floating ball is larger than that of the first plastic hollow floating ball.

Compared with the prior art, the marine drainage device has the beneficial effects that:

the marine drainage device comprises a three-way pipe fixedly connected to a ship side plate, wherein the three-way pipe comprises a water outlet cavity, a water diversion cavity and a water absorption cavity, the water outlet cavity is located on the outer side of the ship side plate and is provided with a downward opening, the water diversion cavity is located above the water outlet cavity and is provided with an upward opening, the water absorption cavity is located on the inner side of the ship side wall, the water absorption cavity, the water diversion cavity and the water outlet cavity are communicated with each other, and the lower end of the water absorption cavity extends into accumulated water in a ship body; a water collecting hopper for collecting rainwater is arranged above the three-way pipe, an opening communicated with the upper end of the water diversion cavity is formed in the bottom of the water collecting hopper, a plug is detachably and hermetically connected to the opening, a driving part is connected to the plug, the plug is driven by the driving part to move upwards, the opening can be opened, rainwater in the water collecting hopper enters the water diversion cavity, the rainwater entering the water diversion cavity flows into a water outlet cavity below the water diversion cavity under the action of gravity, and after the water outlet cavity is filled with rainwater, the plug is driven by the driving part to move downwards to be hermetically connected to the opening, so that the upper end of the water diversion cavity is sealed; the lower end surface of the water outlet cavity is lower than the lower end surface of the water suction cavity, the water suction cavity and the water outlet cavity form a siphon channel, rainwater in the water outlet cavity and the water diversion cavity sucks accumulated water in the ship body into the water suction cavity under the action of gravity and atmospheric pressure, and the rainwater entering the water suction cavity flows out of the water outlet cavity, so that the accumulated water in the ship body is continuously discharged out of the siphon channel; therefore, the marine drainage device can drain accumulated water in the ship body by means of siphon effect, and saves electric energy.

Drawings

FIG. 1 is a schematic view showing a structure of a marine drainage apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic view of a plug structure of a marine drainage device according to an embodiment of the present invention;

in the figure, 1, a ship side plate; 2. a three-way pipe; 21. a water outlet cavity; 22. a water diversion cavity; 23. a water suction cavity; 231. a circular arc portion; 232. a straight tube portion; 3. a water collecting hopper; 4. a plug; 41. a first pulling rope, 42 and a second pulling rope; 43. a first float member; 44. a second float member; 45. a plunger portion; 46. a flange portion; 47. soft magnetic strips; 5. a plug guide structure; 51. guide posts, 52, connection rings; 53. a plug guide space; 6. a one-way valve; 7. a filter member; 8. a deck; 9. fastening a bolt; 10. a water pipe fixing bracket;

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.

As shown in fig. 1 and 2, a preferred embodiment of a marine drainage device according to an embodiment of the present invention includes a tee pipe 2 fixedly connected to a side plate 1 of a ship and a water collecting bucket 3 disposed above the tee pipe 2; the three-way pipe 2 comprises a water outlet cavity 21, a water diversion cavity 22 and a water absorption cavity 23, wherein the water outlet cavity 21 is located on the outer side of the ship side plate 1 and is provided with a downward opening, the water diversion cavity 22 is located above the water outlet cavity 21 and is provided with an upward opening, the water absorption cavity 23 is located on the inner side of the ship side wall 1, the water outlet cavity 21, the water absorption cavity 23 and the water diversion cavity 22 are communicated with each other, the lower end of the water absorption cavity 23 is inserted into accumulated water in the ship body, the upper end of the water absorption cavity 23 is communicated with the water outlet cavity 21, the lower end of the water diversion cavity 22 is communicated with the upper end of the water outlet cavity 21, and the lower end face of the water outlet cavity 21 is lower than the lower end face of the water diversion cavity 23; an opening is formed in the bottom of the water collecting hopper 3, the opening is communicated with the upper end of the water diversion cavity 22, and a plug 4 is detachably and hermetically connected to the opening; the plug 4 is connected with a driving part, when the driving part drives the plug 4 to move upwards, the opening can be opened, so that rainwater in the water collecting hopper 3 enters the water leading cavity 22, the rainwater entering the water leading cavity 22 flows into the water outlet cavity 21 below the water leading cavity 22 under the action of gravity, after the water outlet cavity 21 is filled with the rainwater, the plug 4 is driven to move downwards through the driving part, the plug 4 is connected to the opening in a sealing mode, and the upper end of the water leading cavity 22 is sealed; because the lower end surface of the water outlet cavity 21 is lower than the lower end surface of the water suction cavity 23, the water suction cavity 23 and the water outlet cavity 21 form a siphon channel, rainwater in the water outlet cavity 21 and the water guide cavity 22 sucks accumulated water in the ship body into the water suction cavity 23 under the action of gravity and atmospheric pressure, and the rainwater entering the water suction cavity 23 flows out of the water outlet cavity 21, so that the accumulated water in the ship body is continuously discharged out of the ship from the siphon channel; therefore, the marine drainage device can drain accumulated water in the ship body by means of siphon effect, and electric energy is saved;

in this embodiment, as shown in fig. 1, the lower end of the water suction chamber 23 is provided at a position close to the deck 8 to draw out as much water as possible from the hull. It should be noted that, the driving component and the plug 4 can be set in various forms, if the plug 4 is set in a spherical shape, the bottom of the water collecting bucket 3 is provided with a spherical groove with an opening matched with the spherical plug 4, the driving component is set as a traction rope connected above the plug, when rainwater in the water collecting bucket reaches a certain depth, the traction rope is pulled to open the opening at the bottom of the water collecting bucket 3, and when the rainwater stably flows out from the water outlet cavity 21, the traction rope is loosened to enable the spherical plug 4 to be connected to the opening at the bottom of the water collecting bucket 3 in a sealing manner under the action of gravity, so that the sealing of the opening at the bottom of the water collecting bucket 3 can be realized.

The detachable connection between the plug 4 and the bottom opening of the water collecting bucket 3 is realized in a magnetic suction mode, specifically, the water collecting bucket 3 is made of a metal magnetic material, and the lower end of the plug 4 is magnetically adsorbed on the side wall of the bottom opening of the water collecting bucket 3; the driving component comprises a first traction rope 41 and a second traction rope 42 which are arranged at the upper end of the plug 4, the length of the first traction rope 41 is smaller than that of the second traction rope 42, a first floating piece 43 is arranged on the first traction rope 41, and a second floating piece 44 is arranged on the second traction rope 42; the buoyancy of the first floating piece 43 in water is larger than the gravity of the plug 4 and smaller than the sum of the gravity of the plug 4 and the magnetic adsorption force of the upper end of the side wall of the opening to the plug 4; the sum of the buoyancy of the second floating piece 44 and the first floating piece 43 in water is larger than the sum of the gravity of the plug 4 and the magnetic adsorption force of the upper end of the side wall of the opening to the plug 4.

Specifically, when the rainwater collecting device is used, the plug 4 is arranged in the opening in the bottom of the water collecting hopper 3 in a magnetic absorption mode, rainwater in the water collecting hopper becomes deeper gradually when raining, the first floating piece 43 is immersed by the rainwater firstly due to the fact that the length of the first pulling rope 41 is smaller than that of the second pulling rope 42, upward acting force is applied to the plug 4 through the first pulling rope 41 by the first floating piece 43, and the first floating piece 43 cannot pull out the plug 4 from the opening in the bottom of the water collecting hopper 3 due to the fact that buoyancy force borne by the first floating piece 43 in water is smaller than the sum of magnetic absorption force of the plug 4 and the upper end of the opening side wall to the plug 4; along with the increase of rainfall, the depth of rainwater in the water collecting hopper 3 is gradually increased, when the depth of rainwater exceeds the length of the second pulling rope 42, the second floating piece 44 applies upward acting force to the plug 4, and as the sum of buoyancy of the second floating piece 44 and the first floating piece 43 in water is greater than the sum of gravity of the plug 4 and magnetic adsorption force of the upper end of the side wall of the opening to the plug 4, after the rainwater reaches a certain depth, the plug 4 is pulled out from the opening at the bottom of the water collecting hopper 3 by the second floating piece 44 and the first floating piece 43, at the moment, the opening at the bottom of the water collecting hopper 3 is completely opened, the rainwater in the water collecting hopper flows into the water diversion cavity 22 through the opening at the bottom of the water collecting hopper 3, the rainwater fills the water outlet cavity, and the rainwater in the water collecting hopper 3 gradually descends; when the depth of the rainwater remained in the water collecting bucket 3 is higher than the length of the first pulling rope 41, the buoyancy of the first floating piece 43 in the water is larger than the gravity of the plug 4, so that the plug 4 always floats in the water collecting bucket 3; when the depth of the remaining rainwater in the rainwater hopper 3 is less than the length of the first pulling rope 41, the plug 4 falls down along the plug guide structure 5 into the opening at the bottom of the water collecting hopper 3 under the action of gravity, so that the top of the water diversion chamber 22 is closed.

The first pulling rope 41, the second pulling rope 42, the first floating part 43 and the second floating part 44 are arranged to enable the driving part to automatically control the opening and closing of the bottom opening of the water collecting bucket 3, and moreover, the rainwater quantity entering the water diversion cavity 22 in the water collecting bucket 3 can be controlled by adjusting the lengths of the first pulling rope 41 and the second pulling rope 42, so that the rainwater entering the water diversion cavity 22 can be fully filled in the water outlet cavity 21, the inside of the three-way pipe 2 is further ensured to be in a vacuum state, the rainwater flowing out of the water collecting bucket 3 can be smoothly sucked into the water outlet cavity 21, and the siphon effect can be smoothly achieved.

In this embodiment, the plug 4 comprises a plunger portion 45 matching with the opening and a flange portion 46 connected to the upper end of the plunger portion 45, and a soft magnetic strip 47 is arranged on the annular surface of the flange portion 46 opposite to the opening.

In this embodiment, in order to smoothly plug the bottom opening of the water collecting bucket 3 by the plug 4, the water collecting bucket 3 is provided with the plug guide structure 5, the plug guide structure 5 is provided with a plug guide space 53 which is parallel to the axial direction of the opening, and the flange portion 46 is slidably disposed in the plug guide space 53 up and down. Specifically, the plug 4 is cylindrical, the guide structure 5 includes a connection ring 52 and a plurality of guide posts 51 arranged at intervals along the circumferential direction of the cylindrical plug, the lower end of each guide post 51 is fixedly connected to the bottom of the water collecting hopper 3, the upper end of each guide post 51 is fixedly connected to the connection ring 52, and each guide post 51 encloses a plug guide space 53; the space between the connecting posts 52 enables the plug guide space 53 to communicate with rainwater in the water collecting hopper, wherein the diameter of the inner circle of the connecting ring 52 is smaller than that of the plug 4. When the plug 4 is lifted up under the action of the driving component, the connecting ring 52 stops the plug 4 in the plug guiding space 53, so that the plug 4 can slide down into the bottom opening of the collecting hopper 3 in time after rainwater is drained.

In this embodiment, the water suction cavity 23 includes an arc portion 231 located at the upper portion and a straight tube portion 232 located at the lower portion, the middle of the arc portion 231 is high, the two ends are low, one end of the arc portion 231 is located at the outboard side of the ship board, one end located at the outboard side of the ship board is connected with the water outlet cavity 21, the other end of the arc portion 231 is located at the inboard side of the ship board, one end located at the inboard side of the ship board is connected with the straight tube portion 232, and the straight tube portion 232 extends downward and is communicated with the water accumulated in the ship body. The arc 231 is set to have a shape with a high middle and two low ends, so that one end of the arc 231 is connected with the water outlet cavity 21, rainwater flowing out of the water guide cavity 22 can be prevented from flowing back into the water suction cavity 23, and the reliability of the marine drainage device is ensured.

In this embodiment, in order to ensure that the rainwater flowing out of the water diversion cavity can be completely filled in the water diversion cavity 21, the diameter of the water diversion cavity 22 is set to be larger than the diameter of the water diversion cavity 21 and the diameter of the water suction cavity 23, the diameter of the opening at the bottom of the water collecting bucket 3 is the same as the diameter of the water diversion cavity 22, the part of the upper end of the water suction cavity 23, which is close to the water diversion cavity 21, is provided with the check valve 6, the opening direction of the check valve 6 faces the water diversion cavity 21, and the check valve 6 can prevent the rainwater flowing out of the water diversion cavity 22 from flowing back, for example, into the water suction cavity 23. Furthermore, in order to prevent the one-way valve 6 from being blocked by the impurities in the water in the ship volume, in this embodiment, the lower end of the water suction cavity 23 is provided with the filtering component 7, the filtering component 7 is provided with a plurality of filtering holes, and the filtering holes are communicated with the water suction cavity 23 and the accumulated water in the ship body.

In this embodiment, the first floating member 43 is a first plastic hollow floating ball, the second floating member 44 is a second plastic hollow floating ball, the diameter of the second plastic hollow floating ball is larger than that of the first plastic hollow floating ball, and the diameter of the second plastic floating ball is set to be larger, so that the floating ball member can smoothly open the plug 4.

As shown in fig. 1, in this embodiment, the lower end of the water conduit is fixedly connected with a connecting plate, a fastening bolt 9 is arranged on the connecting plate, and the connecting plate is connected to the side plate of the ship board through the fastening bolt 9; in addition, in order to further increase the stability of the drainage device, in the embodiment, a water pipe fixing support 10 is arranged on the outer side of the hull side plate, one end of the water pipe fixing support 10 is fixedly connected to the ship side plate 1, and the other end of the water pipe fixing support 10 is provided with an annular clamp which is clamped on the outer side wall of the drainage pipe. In this embodiment, the branch pipe is welded on the U-shaped pipe to the three-way pipe adoption, and one side of U-shaped pipe encloses the pipe that absorbs water, and the opposite side is the outlet pipe, and U-shaped pipe and branch pipe all adopt the 20mm internal diameter 18 mm's of external diameter steel pipe to make, and the water collecting bucket is the toper, and water collecting bucket bottom opening diameter is 18mm, and the branch pipe adopts the 22mm internal diameter 20mm steel pipe of external diameter in other embodiments of this application, and water collecting bucket bottom opening diameter is 20 mm.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. The marine drainage device is characterized by comprising a three-way pipe (2) fixedly connected to a ship side plate (1), wherein the three-way pipe (2) comprises a water outlet cavity (21) which is located on the outer side of the ship side plate (1) and has a downward opening, a water guide cavity (22) which is located above the water outlet cavity (21) and has an upward opening, and a water suction cavity (23) which is located on the inner side of the ship side wall (1), the water outlet cavity (21), the water guide cavity (22) and the water suction cavity (23) are communicated with each other, and the lower end surface of the water outlet cavity (21) is lower than the lower end surface of the water guide cavity (23);

a water collecting hopper (3) is arranged above the three-way pipe (2), an opening is formed in the bottom of the water collecting hopper (3), the opening is communicated with the upper end of the water diversion cavity (22), and a plug (4) is detachably and hermetically connected to the opening;

the plug (4) is connected with a driving part, the driving part drives the plug (4) to move upwards so as to open the opening, and rainwater in the water collecting hopper (3) enters the water diversion cavity (22); or the driving component drives the plug (4) to move downwards to close the opening, so that the water diversion cavity (22) is sealed.

2. The marine drainage device according to claim 1, wherein the water collection hopper (3) is made of a metal magnetic material, and the lower end of the plug (4) is magnetically adsorbed on the side wall of the opening.

3. The marine drain device according to claim 2, wherein the driving component comprises a first pulling rope (41) and a second pulling rope (42), the first pulling rope (41) and the second pulling rope (42) are both connected with the plug (4), the length of the first pulling rope (41) is smaller than that of the second pulling rope (42), a first floating piece (43) is arranged at one end of the first pulling rope (41) far away from the plug (4), and a second floating piece (44) is arranged at one end of the second pulling rope (42) far away from the plug (4);

the buoyancy of the first floating piece (43) in water is larger than the gravity of the plug (4) and smaller than the sum of the gravity of the plug (4) and the magnetic adsorption force of the side wall of the opening to the plug (4); the sum of the buoyancy of the second floating piece (44) and the first floating piece (43) in water is larger than the sum of the gravity of the plug (4) and the magnetic adsorption force of the side wall of the opening to the plug (4).

4. A marine drain according to claim 2, characterized in that the blanking plug (4) comprises a plunger portion (45) slidably arranged in the opening and a flange portion (46) connected to an upper end of the plunger portion (45), the flange portion (46) being provided with soft magnetic strips (47) on an annular surface opposite the opening.

5. Marine drainage apparatus according to claim 4, wherein a plug guide structure (5) is provided in the water collection hopper (3), a plug guide space (53) is provided in the plug guide structure (5) in parallel with an axial direction of the opening, and the flange portion (46) is provided in the plug guide space (53) so as to slide up and down.

6. Marine drain according to claim 5, characterised in that the stopper (4) is cylindrical, the stopper guide structure (5) comprising a connecting ring (52) and a plurality of guide posts (51) arranged at intervals in the circumferential direction of the cylindrical stopper (4);

the lower end of each guide post (51) is fixedly connected to the bottom of the water collecting hopper (3), the upper end of each guide post (51) is fixedly connected to the connecting ring (52), and the guide posts (51) surround the plug guide space (53);

the diameter of the inner circle of the connecting ring (52) is smaller than that of the plug (4).

7. The marine drainage device according to claim 1, wherein the water suction cavity (23) comprises an arc portion (231) at the upper part and a straight tube portion (232) at the lower part, the arc portion (231) has a high middle and two low ends, a first end of the arc portion (231) is positioned outside the side ship board (1), and a first end of the arc portion (231) is connected with the outlet cavity (21);

the second end of circular arc portion (231) is located ship side plate (1) inboard, the second end of circular arc portion (231) is connected straight section of thick bamboo portion (232), straight section of thick bamboo portion (232) downwardly extending to the bottom of ship side plate (1).

8. The marine drainage device according to claim 1, characterized in that the diameter of the drainage cavity (22) is larger than the diameter of the outlet cavity (21) and the diameter of the water suction cavity (23), a one-way valve (6) is arranged at the upper end of the water suction cavity (23) close to the outlet cavity (21), and the opening direction of the one-way valve (6) faces the outlet cavity (21).

9. Marine drain arrangement according to claim 8, characterised in that the suction chamber (23) is provided with a filter element (7) at its lower end.

10. The marine drain of claim 1, wherein the first float member (43) is a first plastic hollow float ball and the second float member (44) is a second plastic hollow float ball, the second plastic hollow float ball having a diameter greater than the diameter of the first plastic hollow float ball.