Bubble generating device with detachable hinge structure

Abstract

The utility model discloses a bubble generating device with a detachable hinge structure, and belongs to the technical field of ship resistance reduction. The device comprises a bottom plate, an air cavity, a detachable cover plate and a flow guide plate. The bottom surface of the bottom plate is provided with an opening for introducing air, and the top surface is communicated with the air inlet pipe through the air cavity. A flow guide plate is fixed to the end, away from the air cavity, of the bottom face opening of the bottom plate and inclines downwards, so that air can enter the ship bottom under the action of the flow guide plate. One side of the detachable cover plate is hinged to the flow guide plate, and the other side of the detachable cover plate is connected with a bottom plate connecting plate in the air cavity through a countersunk bolt and a slotted nut, so that the detachable cover plate is flush with the bottom face of the bottom plate. The detachable cover plate in the device is convenient to clean and replace, the ventilation opening is flush with the outer surface of the ship bottom after installation is completed, and sailing resistance is reduced. In addition, the countersunk bolt and the slotted nut are reinforced through the cotter pin, and connection looseness caused by vibration is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of ship drag reduction, and in particular relates to a bubble generating device with a detachable hinged structure. Background Art

[0002] Among the many drag reduction technologies, gas lubrication drag reduction has always attracted much attention in the field of ship speed increase and energy saving due to its advantages such as simple structure, easy operation and good economy. The main technical idea of ​​gas lubrication drag reduction technology is to introduce air to the bottom of the ship, form continuous or discrete bubbles between the hull and the water, reduce the density and viscosity of the fluid around the hull, and thus significantly reduce the friction resistance of the ship.

[0003] Due to factors such as seawater erosion and attachment of marine organisms, it is necessary to regularly clean the internal flow channels of the ventilation generator or replace some parts, otherwise the vent may be blocked and the gas cannot flow out normally. Therefore, some parts of the ventilation generator need to be detachable to facilitate subsequent cleaning and replacement. In practical applications, the ventilation generator is an important part of gas lubrication drag reduction technology, and its structure has a great influence on the drag reduction effect. Whether the bottom surface of the ventilation generator is flush with the bottom surface of the ship will affect the hull drag, and then affect the overall drag reduction effect. Therefore, it is necessary to ensure the flatness of the bottom surface of the ventilation generator.

[0004] The Chinese invention patent with publication number CN116476971A designs a removable cover plate that is conformal to the bottom of the ship, but this design does not take into account the protruding part of the cover plate at the connection between the bolts and nuts, which will increase the form resistance of the device; the Chinese utility model patent CN217022794U designs a removable cover plate with a concave structure, which reduces the impact of the bolt and nut connection on the surface form resistance, but this design has a large number of connection ports, which is inconvenient to position during connection. Neither of the above two patents has an anti-loosening design for the removable structure. In actual use, the cover plate may not be firm. The vibration of the device during navigation may cause air leakage in the structural gap, thereby destroying the ventilation effect, and may even cause the removable cover plate to fall off.

[0005] Taking the above into consideration, it is necessary to improve the design of a ventilation generating device with a detachable structure, which should ensure that the bottom surface of the device is flush with the bottom surface of the ship and that its components can be disassembled and assembled. Utility Model Content

[0006] The utility model aims to solve the deficiencies of the prior art and provide a bubble generating device with a detachable hinged structure.

[0007] The specific technical solutions adopted by this utility model are as follows:

[0008] The utility model provides a bubble generating device with a detachable hinged structure, comprising a bottom plate, an air cavity, a detachable cover plate and a guide plate;

[0009] The bottom plate is connected to the hull steel plate, and an opening for letting in air is provided on the bottom surface of the bottom plate, and the opening is provided along the length direction of the bottom plate; the top surface of the bottom plate is connected to the air intake pipe through the air cavity; a guide plate is fixed to the end of the bottom surface opening of the bottom plate away from the air cavity, and the guide plate is inclined downward from the end away from the air cavity to the end close to the air cavity, so that the air in the air cavity can enter the bottom of the ship under the guiding effect of the guide plate;

[0010] The removable cover plate is arranged on the side of the bottom surface of the base plate close to the air cavity, and the side of the removable cover plate away from the air cavity is hinged with the guide plate through a hinged connection component, so that the removable cover plate can rotate 180° with the hinged connection component as the axis; a cover plate connecting plate is provided on the side of the removable cover plate close to the air cavity; a base plate connecting plate matching the cover plate connecting plate is fixed on the side wall of the air cavity; a countersunk hole for inserting a countersunk bolt is provided on the cover plate connecting plate, and a connecting hole corresponding to the countersunk hole is provided on the base plate connecting plate; the head of the countersunk bolt is a plane, the countersunk bolt passes through the countersunk hole and the connecting hole, the bottom of the bolt rod of the countersunk bolt is connected to the slotted nut, and the removable cover plate is fixed to the bottom surface of the base plate by tightening the slotted nut, and the removable cover plate is flush with the bottom surface of the base plate.

[0011] Preferably, a through hole for passing a cotter pin is provided at the bottom of the bolt rod of the countersunk bolt, and the through hole is opened along the diameter direction of the bolt rod; the cotter pin is inserted into the groove on the slotted nut and the through hole at the bottom of the bolt rod of the countersunk bolt for reinforcement.

[0012] Preferably, a supporting rib plate for supporting the removable cover plate is vertically arranged in the air cavity; one side of the supporting rib plate is fixedly connected to the side wall of the air cavity, and the other end is fixedly connected to the guide plate.

[0013] Furthermore, a limiting groove matching the supporting rib is provided on the cover connecting plate of the detachable cover.

[0014] Preferably, the bottom surface opening of the bottom plate is close to one end of the air cavity, and limiting plates for limiting the detachable cover plate are fixed on both sides.

[0015] Preferably, the bottom plate, the removable cover plate and the guide plate are made of the same material as the hull outer plate.

[0016] Furthermore, the bottom plate, the removable cover plate and the guide plate are made of marine carbon steel or stainless steel.

[0017] Preferably, a plurality of reinforcing ribs are fixed to the top surface of the bottom plate, and the reinforcing ribs extend from the air cavity to an end away from the air cavity.

[0018] Preferably, a plurality of reinforcing ribs are arranged transversely on the top surface of the bottom plate, and the arrangement direction of the reinforcing ribs is perpendicular to the incoming flow direction.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] (1) In the bubble generating device provided by the utility model, the cover plate is detachable, which is convenient for cleaning and replacement; the detachable cover plate and the guide plate are first connected by a hinge, which makes it easier to position the detachable cover plate when installing; in addition, the support and connection provided by the hinge make it easier to disassemble and inspect the air cavity.

[0021] (2) In the bubble generating device provided by the utility model, the removable cover plate is connected to the bottom plate by countersunk bolts and slotted nuts, so that the bottom surfaces of the removable cover plate and the bottom plate are flush, avoiding the connector from damaging the surface flatness of the cover plate, and significantly reducing the sailing resistance. In addition, the cotter pin is inserted into the groove on the slotted nut and the through hole at the bottom of the bolt rod of the countersunk bolt for reinforcement to avoid loosening caused by vibration.

[0022] (3) In the present invention, the connection between the removable cover plate and the bottom plate, especially the connection thread, is sprayed with anti-corrosion paint to prevent seawater from corroding the thread and affecting the subsequent disassembly and maintenance of the air cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic bottom view of the overall bubble generating device provided in this embodiment;

[0024] Figure 2 A schematic top view of the overall bubble generating device provided in this embodiment;

[0025] Figure 3 A top view of the bubble generating device provided in this embodiment without the detachable cover plate installed;

[0026] Figure 4 A schematic diagram of a detachable cover provided in this embodiment;

[0027] Figure 5 A schematic diagram of the installation process of the detachable cover provided in this embodiment;

[0028] Figure 6 A schematic diagram showing the installation of the detachable cover provided in this embodiment;

[0029] Figure 7 A schematic diagram of the installation of the countersunk hole of the detachable cover provided in this embodiment;

[0030] In the figure: bottom plate 1, air cavity 2, removable cover plate 3, guide plate 4, supporting rib plate 5, hinged connection component 6, air intake pipe 7, limit plate 101, bottom plate connecting plate 201, cover plate connecting plate 301, countersunk hole 302 DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model. Therefore, the utility model is not limited by the specific embodiments disclosed below. The technical features in each embodiment of the utility model can be combined accordingly without conflicting with each other.

[0032] like Figure 1 As shown, as a preferred mode of the specific implementation provided by the utility model, this embodiment provides a bubble generating device with a detachable hinged structure, including a bottom plate 1, an air cavity 2, a detachable cover plate 3 and a guide plate 4.

[0033] In the device provided by the utility model, the bottom plate 1 is connected to the hull steel plate, and an opening for letting in air is provided on the bottom surface of the bottom plate 1, and the opening is provided along the length direction of the bottom plate 1. The top surface of the bottom plate 1 is connected to the air intake pipe 7 through the air cavity 2. A guide plate 4 is fixed to the end of the bottom surface opening of the bottom plate 1 away from the air cavity 2, and the guide plate 4 is tilted downward from the end away from the air cavity 2 to the end close to the air cavity 2, so that the air in the air cavity 2 can enter the bottom of the ship under the guiding effect of the guide plate 4. The bottom surface opening of the bottom plate 1 is close to the end of the air cavity 2, and both sides are fixed with a limit plate 101 for limiting the removable cover plate 3.

[0034] In this embodiment, the guide plate is pre-polished, and the inclination angle of the guide plate 8 is 3°. Those skilled in the art can also select a suitable inclination angle according to specific circumstances so that air can smoothly enter the bottom of the ship. The angle can be in the range of 2° to 10°.

[0035] In the device provided by the utility model, the removable cover plate 3 is arranged on the side of the bottom surface of the bottom plate 1 close to the air cavity 2. The side of the removable cover plate 3 away from the air cavity 2 is hinged with the guide plate 4 through the hinged connection part 6, so that the removable cover plate 3 can rotate 180° with the hinged connection part 6 as the axis. The utility model does not limit the specific structure and number of the hinged connection parts, as long as the hinge is satisfied. The side of the removable cover plate 3 close to the air cavity 2 is provided with a cover plate connecting plate 301, as shown in FIG. Figure 4 The side wall of the air cavity 2 is fixed with a bottom plate connecting plate 201 matching the cover plate connecting plate 301. Figure 3 shown.

[0036] In this embodiment, a support rib 5 for supporting the removable cover plate 3 is vertically arranged in the air cavity 2. One side of the support rib 5 is fixedly connected to the side wall of the air cavity 2, and the other end is fixedly connected to the guide plate 4. A limiting groove matching the support rib 5 is provided on the cover plate connecting plate 301 of the removable cover plate 3.

[0037] Figure 4 The schematic diagram of the removable cover provided in this embodiment is that the cover 1 connecting plate 301 is provided with a countersunk hole 302 for inserting a countersunk bolt, and the bottom plate connecting plate 201 is provided with a connecting hole corresponding to the countersunk hole 302. The head of the countersunk bolt is a plane, and the countersunk bolt passes through the countersunk hole 302 and the connecting hole. The bottom of the bolt rod of the countersunk bolt is connected to the slotted nut. The removable cover 3 is fixed to the bottom surface of the bottom plate 1 by tightening the slotted nut. The removable cover 3 is flush with the bottom surface of the bottom plate 1. Figure 7 As shown in the figure. The heads of conventional connectors are usually convex structures. The use of conventional connectors cannot ensure the flatness of the bottom plate surface and will still increase the shape resistance. However, since the head of the countersunk bolt is a flat surface, the use of the countersunk bolt can significantly reduce the sailing resistance.

[0038] In order to enhance the tightness of the connection between the removable cover plate 3 and the base plate 1 and prevent the structure from loosening or even falling off due to vibration, in this embodiment, a through hole for passing a cotter pin is provided at the bottom of the bolt rod of the countersunk bolt, and the through hole is opened along the diameter direction of the bolt rod. The main structural feature of the slotted nut is that a groove is machined above the hexagonal nut. This structure enables it to be used in conjunction with a screw hole bolt and a cotter pin to prevent the bolt and the nut from rotating relative to each other. The cotter pin is inserted into the groove on the slotted nut and the opening at the bottom of the bolt rod of the countersunk bolt for reinforcement.

[0039] In order to avoid local stress concentration caused by material differences, in this embodiment, the bottom plate 1, the removable cover plate 5 and the guide plate 8 are generally made of the same material as the ship's outer plate, generally marine carbon steel.

[0040] On the other hand, stainless steel has strong corrosion resistance, especially in marine environments, and can effectively resist the erosion of salt water and other corrosive substances. In addition, stainless steel has high strength and can withstand greater mechanical stress and impact. Therefore, the bottom plate 1, the removable cover plate 3 and the guide plate 4 can also be made of stainless steel.

[0041] In order to improve the strength and stability of the overall bubble generating device, a plurality of reinforcing ribs are fixed to the top surface of the bottom plate 1. Figure 2 As shown, in this embodiment, three reinforcing ribs are provided, which are vertically fixed to the top surface of the bottom plate by welding, and the reinforcing ribs extend from the air cavity 2 to an end away from the air cavity 2.

[0042] Considering that the removable cover plate 3 and the bottom plate 1 are immersed in seawater for a long time, the connection will be corroded by seawater and marine organisms. In order to prevent the connection from rusting and rotting, in this embodiment, anti-corrosion paint is sprayed on the connection between the removable cover plate 3 and the bottom plate 1.

[0043] like Figure 5 As shown, during assembly, the removable cover plate 3 and the guide plate 4 are connected by hinges, and then the removable cover plate 3 is placed on the limit plate 101, and the cover plate connecting plate 301 on the removable cover plate 3 and the bottom plate connecting plate 201 in the air cavity 2 are fixedly connected by countersunk bolts and slotted nuts, so that the bottom surfaces of the removable cover plate 3 and the bottom plate 1 are flush, as shown in FIG. Figure 6 shown.

[0044] The utility model provides a bubble generating device with a detachable hinged structure, wherein the detachable cover plate is easy to clean and replace. In addition, the detachable cover plate and the bottom plate are in the same plane, thus overcoming the problem of large sailing resistance caused by the non-co-shape of the bottom of the existing cover plate and the bottom plane of the ship.

[0045] The above-described embodiment is only a preferred solution of the present invention, but it is not intended to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A bubble generating device with a detachable hinge structure, characterized in that: It comprises a bottom plate (1), an air cavity (2), a detachable cover plate (3) and a guide plate (4); The bottom plate (1) is connected to the hull steel plate, and an opening for letting in air is provided on the bottom surface of the bottom plate (1); the top surface of the bottom plate (1) is connected to the air intake pipe (7) through the air cavity (2); a guide plate (4) is fixed to the end of the bottom surface opening of the bottom plate (1) away from the air cavity (2), and the guide plate (4) is inclined from the end away from the air cavity (2) to the end close to the air cavity (2), so that the air in the air cavity (2) can enter the bottom of the ship under the guidance of the detachable cover plate (3) and the guide plate (4); The removable cover plate (3) is arranged on a side of the bottom surface of the bottom plate (1) close to the air cavity (2); the side of the removable cover plate (3) away from the air cavity (2) is hingedly connected to the guide plate (4) via a hinged connection component (6), so that the removable cover plate (3) can rotate around the hinged connection component (6) as an axis; a cover plate connecting plate (301) is provided on the side of the removable cover plate (3) close to the air cavity (2); a bottom plate connecting plate matching the cover plate connecting plate (301) is fixed on the side wall of the air cavity (2) (201); a countersunk hole (302) for inserting a countersunk bolt is provided on the cover plate connecting plate (301), and a connecting hole corresponding to the countersunk hole (302) is provided on the base plate connecting plate (201); the head of the countersunk bolt is a plane, the countersunk bolt passes through the countersunk hole (302) and the connecting hole, the bottom of the bolt rod of the countersunk bolt is connected to the slotted nut, and the removable cover plate (3) is fixed to the bottom surface of the base plate (1) by tightening the slotted nut, and the removable cover plate (3) and the bottom surface of the base plate (1) are flush.

2. The bubble generating device according to claim 1, characterized in that: A through hole for passing a cotter pin is provided at the bottom of the bolt rod of the countersunk bolt, and the through hole is opened along the diameter direction of the bolt rod; the cotter pin is inserted into the groove on the slotted nut and the through hole at the bottom of the bolt rod of the countersunk bolt to prevent loosening.

3. The bubble generating device according to claim 1, characterized in that: A supporting rib plate (5) for supporting the removable cover plate (3) is vertically arranged in the air cavity (2); one side of the supporting rib plate (5) is fixedly connected to the side wall of the air cavity (2), and the other end is fixedly connected to the guide plate (4).

4. The bubble generating device according to claim 3, characterized in that: A limiting groove matching the supporting rib plate (5) is provided on the cover plate connecting plate (301) of the detachable cover plate (3).

5. The bubble generating device according to claim 1, characterized in that: The bottom surface opening of the bottom plate (1) is close to one end of the air cavity (2), and limiting plates (101) for limiting the position of the detachable cover plate (3) are fixed on both sides.

6. The bubble generating device according to claim 1, characterized in that: The connection between the detachable cover plate (3) and the base plate (1) is sprayed with anti-corrosion paint.

7. The bubble generating device according to claim 1, characterized in that: The bottom plate (1), the detachable cover plate (3) and the guide plate (4) are made of the same material as the outer plate of the hull.

8. The bubble generating device according to claim 7, characterized in that: The bottom plate (1), the detachable cover plate (3) and the guide plate (4) are made of marine carbon steel or stainless steel.

9. The bubble generating device according to claim 1, characterized in that: A plurality of reinforcing ribs are fixed to the top surface of the bottom plate (1), and the reinforcing ribs extend from the air cavity (2) to an end away from the air cavity (2).

10. The bubble generating device according to claim 1, characterized in that: A plurality of reinforcing ribs are arranged transversely on the top surface of the bottom plate (1), and the arrangement direction of the reinforcing ribs is perpendicular to the incoming flow direction.

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