Stable telescopic bulbous bow

Abstract

The bulbous bow is arranged on the lower side of a ship bow, a bulbous bow watertight compartment sunken towards the inner side of a ship body is arranged on the lower side of the ship bow in the X direction, and the bulbous bow comprises a bulbous bow outer plate, a positioning module and a driving module; the bulbous bow outer plate arranged in the bulbous bow watertight compartment can extend out of or retract into the bulbous bow watertight compartment along the X direction under the action of the driving module; the positioning module comprises a positioning rod and a limiting block, one end of the positioning rod is fixed to the stern end of the bulbous bow outer plate in the X direction, the other end of the positioning rod is arranged in the ship body, the limiting block is perpendicular to the positioning rod and fixed in the ship body, and the positioning rod sequentially penetrates through the bulbous bow watertight compartment and the limiting block in the direction from the outside to the inside of the ship. A limiting hole is formed in the limiting block, and the positioning rod penetrates through the limiting hole and can slide in the limiting hole in the X direction. The bulbous bow is high in structural property and stability and can stably stretch out and draw back under various sailing conditions, so that the wave-making resistance of the ship is always the minimum under the variable sailing speed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of shipbuilding technology, in particular to a ball nose that can be stably extended and retracted. BACKGROUND

[0002] In order to reduce the wave-making resistance of the ship body at the designed speed, a ball nose is usually fixed on the lower side of the bow, the size and fixed position of the ball nose are determined according to the results of CFD calculation or pool experiment at the designed speed, and the ship has a deviation in the sailing speed from the designed speed for a part of the time in the actual operation, when the ship is in the state of non-designed speed, the fixed ball nose may increase the wave-making resistance and reduce the sailing efficiency of the ship. CONTENT OF THE UTILITY MODEL

[0003] In view of the defects in the prior art, the present application provides a ball nose that can be stably extended and retracted to solve the technical problems of the ball nose fixed on the lower side of the bow in the prior art, the limited speed range adapted, and the sailing efficiency and economy of the ship reduced.

[0004] In order to achieve the above-mentioned purpose, the technical scheme provided by the present application is as follows:

[0005] A ball nose that can be stably extended and retracted, the ball nose is arranged on the lower side of the bow, defining the direction along the bow and stern as the X axis, the direction along the ship height as the Z axis, and the direction along the ship width as the Y axis, the lower side of the bow is provided with a bulbous bow watertight cabin along the X direction, the bulbous bow watertight cabin is recessed to the inside of the ship body, and the bulbous bow watertight cabin and the outer plate of the ship body constitute the watertight boundary of the bow part.

[0006] The ball nose comprises a bulbous bow outer plate, a positioning module and a driving module, the bulbous bow outer plate is arranged in the bulbous bow watertight cabin, and the bulbous bow outer plate can be extended or retracted in the bulbous bow watertight cabin along the X direction under the action of the driving module; the positioning module comprises a positioning rod and a limiting block, the positioning rod is arranged along the X direction, one end of the positioning rod is fixed at the stern end of the bulbous bow outer plate, the other end of the positioning rod is arranged inside the ship body, and the limiting block is fixed inside the ship body perpendicularly to the positioning rod; the positioning rod passes through the bulbous bow watertight cabin and the limiting block in the direction from the outside of the ship to the inside of the ship in sequence, and at least one limiting hole is arranged on the limiting block, the positioning rod passes through the limiting hole and can slide along the X direction in the limiting hole.

[0007] In an embodiment, one end of the positioning rod arranged inside the ship body is fixedly provided with a stop block, and the size of the stop block is greater than the diameter of the limiting hole.

[0008] In an embodiment, the positioning module comprises two limiting blocks, and the two limiting blocks are arranged at intervals along the X direction.

[0009] In an embodiment, the driving module comprises a driving winch and a screw rod, one end of the screw rod is fixed at the aft end of the bow bulb outer plate, the other end of the screw rod is arranged inside the ship body, the driving winch is fixed inside the ship body, the screw rod passes through the driving winch, the inside of the driving winch is provided with a driving nut engaged with the screw rod, and the driving winch controls the extension and retraction of the screw rod along the X direction by rotating around the X axis through the driving nut, so as to control the length of the bow bulb outer plate extending out of the ship body outer plate.

[0010] In an embodiment, the driving winch has a locking function of locking the driving nut or the screw rod, so as to fix the length of the bow bulb outer plate extending out of the ship body outer plate when the sailing speed is stable.

[0011] In an embodiment, the driving winch is communicatively connected with a ship body speed measuring device, and the driving winch adjusts the extension and retraction length of the bow bulb outer plate in real time according to the actual sailing speed read during sailing, so as to adjust the length of the bow bulb outer plate extending out to the corresponding optimal length of the bow bulb outer plate under different sailing speeds.

[0012] In an embodiment, the positioning module comprises four positioning rods, the limiting blocks are rectangular blocks, limiting holes are arranged at the four corners of the limiting blocks, a through hole is arranged at the center of the limiting block, the driving winch is arranged between the two limiting blocks, and the screw rod passes through the through hole.

[0013] In an embodiment, the distance between the bow bulb outer plate and the bulkhead of the bow bulb watertight cabin is 5-10 mm.

[0014] Compared with the prior art, the application has at least the following beneficial effects:

[0015] The bow bulb in the application can be stably extended and retracted, and comprises a bow bulb outer plate arranged in a bow bulb watertight cabin, the bow bulb outer plate is extended or retracted along the X direction under the action of the driving module, so as to change the flow field characteristics of the ship, make the flow field more suitable for the actual sailing speed of the ship, reduce the wave making resistance of the ship sailing, and also can retract the bow bulb into the ship body in a poor channel, reduce the probability of the bow bulb being damaged by collision; the driving module in the application comprises a locking function of fixing the length of the bow bulb outer plate extending out of the ship body outer plate, ensures the stability of the flow field characteristics of the ship under a fixed sailing speed, makes the wave making resistance of the ship under the fixed sailing speed remain in the minimum state, the driving module is also communicatively connected with a ship body speed measuring device, realizes the automatic adjustment of the length of the bow bulb according to the actual sailing speed, and makes the wave making resistance of the ship under the variable sailing speed always minimum.

[0016] In the application, the movement of the bulbous bow outer plate in Y and Z directions is limited by the cooperation of the limiting block in the positioning module and the positioning rod. The stability and reliability of the structure strength of the telescopic bulbous bow during operation are ensured by the meshing of the driving winch and the screw rod, the locking function of the winch, the prevention of the positioning rod from being detached from the limiting block by the stop block, and the fixed connection of the limiting block, the driving winch and the ship structure.

[0017] In the application, the movable member passing through the watertight outer plate of the ship is a regular-shaped positioning rod and a screw rod, which greatly reduces the difficulty of ensuring the water tightness of the movable part. The application improves the anti-pollution ability of the bulbous bow watertight cabin, reduces the impact force of the head-on wave load on the bulbous bow watertight cabin, reduces the mechanical failure rate of the whole system, prolongs the service life of the bulbous bow, and the arrangement of the bulbous bow in the application is very compact, which is beneficial to saving the internal space of the bow of the ship and avoiding interference with the bow side thrust and other equipment. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the ship structure provided with the stable and telescopic bulbous bow in the embodiment of the application;

[0019] Figure 2 is a schematic diagram of the stable and telescopic bulbous bow in the embodiment of the application;

[0020] Figure 3 is a schematic diagram of the driving winch in the embodiment of the application;

[0021] Figure 4 is Figure 3 is the A-A sectional view in the application;

[0022] Figure 5 is a schematic diagram of the limiting block in the embodiment of the application;

[0023] Reference signs: 1, bulbous bow outer plate; 2, ship outer plate; 3, bulbous bow watertight cabin; 4, positioning rod; 5, screw rod; 6, limiting block; 7, driving winch; 8, stop block; 9, driving nut. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the application more clear and obvious, the application will be described below through specific embodiments shown in the drawings. However, it should be understood that these descriptions are only exemplary and do not limit the scope of the application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the application.

[0025] The terminology used in the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in the description of the disclosure and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0026] It is to be understood that the terms first, second, third, etc. can be employed merely for distinguishing between information objects of different stages and do not limit the scope of the disclosure based on the relative importance of the information objects. Rather, these terms are used solely to distinguish between information objects of different stages. For example, a first information object can be termed a second information object, and similarly, a second information object can be termed a first information object, without departing from the scope of the disclosure. The word "if' as used herein means "when" or "upon" or "in response to the determination" depending on the context.

[0027] In the description of the present application, unless otherwise specified and limited, it is necessary to explain that the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be mechanical connection, or the communication between the internal elements, it can be direct connection, or indirect connection through intermediate medium, the specific meaning of the above terms can be understood by the person skilled in the art according to the specific circumstances.

[0028] In order to better understand the technical scheme of the present application, the present application will be described in detail below in combination with the drawings.

[0029] The X-axis is defined as the bow-stern direction, the Z-axis is defined as the height direction of the ship, and the Y-axis is defined as the width direction of the ship. The present embodiment provides a stable and telescopic bow, which is arranged on the lower side of the bow of the ship, such as Figure 1 、 2As shown, the lower side of the bow is provided with a bulbous bow water-tight cabin 3 along the X direction, the bulbous bow water-tight cabin 3 is recessed to the inside of the hull, the bulbous bow water-tight cabin 3 and the hull plate 2 constitute the bow water-tight boundary, the bulbous bow includes the bulbous bow plate 1, the positioning module and the driving module; wherein, the bulbous bow plate 1 is arranged in the bulbous bow water-tight cabin 3, the bulbous bow plate 1 can be extended or retracted in the bulbous bow water-tight cabin 3 along the X direction under the action of the driving module; the positioning module includes a positioning rod 4 and a limiting block 6, the positioning rod 4 is arranged along the X direction, one end of the positioning rod 4 is fixed at the stern end of the bulbous bow plate 1, the other end of the positioning rod 4 is arranged in the inside of the hull, the limiting block 6 is fixed in the inside of the hull perpendicular to the positioning rod, the limiting block 6 is perpendicular to the positioning rod 4, the positioning rod 4 passes through the bulbous bow water-tight cabin 3 and the limiting block 6 in turn along the direction from the outside of the ship to the inside of the ship, at least one limiting hole is arranged on the limiting block 6, the positioning rod 4 passes through the limiting hole and can slide along the X direction in the limiting hole, so as to ensure that the bulbous bow plate 1 can only move forward and backward along the X direction, cannot move to the Y and Z directions, and cannot rotate.

[0030] In this embodiment, the positioning module includes two limiting blocks 6, the two limiting blocks 6 are arranged along the X direction at intervals, so as to improve the stability of the bulbous bow plate 1 moving along the X direction. One end of the positioning rod 4 arranged in the inside of the hull is fixedly provided with a stop block 8, the size of the stop block 8 is greater than the diameter of the limiting hole, so as to limit the length of the bulbous bow plate 1 extending out of the bulbous bow water-tight cabin 3, and avoid the positioning rod 4 and the bulbous bow plate 1 from falling into the water by separating from the hull.

[0031] As shown in Figure 3 , 4 , the driving module in this application includes a driving winch 7 and a screw rod 5, one end of the screw rod 5 is fixed at the stern end of the bulbous bow plate 1, the other end of the screw rod 5 is arranged in the inside of the hull, the driving winch 7 is fixed in the inside of the hull, the screw rod 5 passes through the driving winch 7, the inside of the driving winch 7 is provided with a driving nut 9 engaged with the screw rod 5, the driving winch 7 controls the extension and retraction of the screw rod 5 along the X direction by rotating around the X axis through the driving nut 9, so as to control the length of the bulbous bow plate 1 extending out of the hull plate 2. In this embodiment, the driving winch 7 is arranged between the two limiting blocks 6. The driving winch 7 has a locking function of locking the movement of the driving nut 9 or the screw rod 5, so as to fix the length of the bulbous bow plate 1 extending out of the plate 2 when the sailing speed is stable. In this embodiment, the driving winch 7 is provided with a wedge block for locking the movement of the driving nut 9. In other embodiments, the driving winch 7 is provided with a wedge block for locking the movement of the screw rod 5. The driving winch 7 is communicatively connected with the hull testing device, the driving winch 7 adjusts the extension and retraction length of the bulbous bow plate 1 in real time according to the actual sailing speed read during sailing, so that the length of the bulbous bow plate 1 extending out reaches the corresponding optimal length of the bulbous bow plate 1 under different sailing speeds, so as to make the wave-making resistance of the ship always the smallest under different sailing speeds.

[0032] As shown in Figure 5As shown, the positioning module includes four positioning rods 4, the limiting blocks 6 are rectangular blocks, limiting holes are arranged at four corners of the limiting blocks 6, the limiting holes are symmetrically arranged, a through hole is arranged at the center of the limiting block 6, the screw rod 5 passes through the through hole and can move in the X direction in the limiting hole, by arranging multiple limiting blocks 6, arranging multiple limiting holes on the limiting blocks 6 and arranging the screw rod to pass through the limiting blocks, the stability during the working of the bulb bow and the reliability of the structural strength can be improved, and the practical engineering application is facilitated.

[0033] In the embodiment, the distance between the bulb bow outer plate 1 and the bulkhead of the bulb water-tight cabin 3 is 5-10 mm, the small gap between the bulb bow outer plate 1 and the bulb water-tight cabin 3 can improve the antifouling ability inside the bulb water-tight cabin 3, reduce the impact force of the head-on wave load on the inside of the bulb water-tight cabin 3, reduce the mechanical failure rate of the whole system and improve the service life of the bulb bow.

[0034] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application and not to limit them; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand; the specific embodiments of the application can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solutions of the present application, they should be covered in the technical solution range of the present application.

Claims

1. A bow with a retractable bulb, which is provided on the lower side of a bow, defining an X axis in the fore-aft direction, a Z axis in the vertical direction, and a Y axis in the transverse direction, characterized in that, The lower side of the bow is provided with a bulbous bow watertight cabin along the X direction, the bulbous bow watertight cabin is recessed to the inside of the hull, and the bulbous bow watertight cabin and the hull plate constitute the bow watertight boundary; The bulbous bow includes a bulbous bow plate, a positioning module and a driving module, the bulbous bow plate is arranged in the bulbous bow watertight cabin, and the bulbous bow plate can be extended or retracted in the bulbous bow watertight cabin along the X direction under the action of the driving module; the positioning module includes a positioning rod and a limiting block, the positioning rod is arranged along the X direction, one end of the positioning rod is fixed at the stern end of the bulbous bow plate, the other end of the positioning rod is arranged inside the hull, and the limiting block is fixed inside the hull perpendicularly to the positioning rod, the positioning rod passes through the bulbous bow watertight cabin and the limiting block in sequence along the direction from the outside of the ship to the inside of the ship, and at least one limiting hole is arranged on the limiting block, the positioning rod passes through the limiting hole and can slide along the X direction in the limiting hole.

2. The bulbous bow according to claim 1, characterized in that One end of the positioning rod arranged inside the hull is fixedly provided with a stop block, and the size of the stop block is greater than the diameter of the limiting hole.

3. The bulb bow of claim 1, wherein, The positioning module includes two limiting blocks, and the two limiting blocks are arranged at intervals along the X direction.

4. The bulbous bow according to claim 3, characterized in that The driving module includes a driving winch and a screw rod, one end of the screw rod is fixed at the stern end of the bulbous bow plate, the other end of the screw rod is arranged inside the hull, the driving winch is fixed inside the hull, the screw rod passes through the driving winch, the inside of the driving winch is provided with a driving nut engaged with the screw rod, and the driving winch controls the extension and retraction of the screw rod along the X direction by rotating around the X axis through the driving nut, so as to control the length of the bulbous bow plate extending out of the hull plate.

5. The bulbous bow according to claim 4, characterized in that The driving winch has a locking function of locking the movement of the driving nut or the screw rod, so as to fix the length of the bulbous bow plate extending out of the hull plate when the sailing speed is stable.

6. The bulb bow of claim 4, wherein, The driving winch is in communication connection with a hull speed measuring device, and the driving winch adjusts the extension and retraction length of the bulbous bow plate in real time according to the actual sailing speed read during sailing, so as to adjust the length of the bulbous bow plate extending out to the corresponding optimal length of the bulbous bow plate under different sailing speeds.

7. The bulb bow of claim 4, wherein, The positioning module includes four positioning rods, the limiting block is a rectangular block, limiting holes are arranged at four corners of the limiting block, a through hole is arranged at the center of the limiting block, the driving winch is arranged between the two limiting blocks, and the screw rod passes through the through hole and can move along the X direction in the through hole.

8. The bulb bow of claim 4, wherein, The distance between the bulbous bow plate and the bulbous bow watertight cabin wall is 5-10 mm.

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