A full-rotation propeller fairing cover plate structure and a mounting method thereof

Abstract

This invention relates to the field of marine technology and discloses a azimuth thruster fairing cover structure and its installation method. The structure includes an upper cover (12), a lower cover (2), and a cover plate (1). The upper cylinder (7) is connected to the lower cover (2) via the upper cover (12). A cover plate (1) is provided at the bottom of the lower cover (2), and a circular hole (11) is formed on the cover plate (1). A gap exists between the circular hole (11) and the lower cylinder (6). The bottom of the lower cover (2) has a plane boundary (10) and a folded boundary (9). The cover plate (1) has a cover plate boundary (8). A gap exists between the cover plate boundary (8) and the plane boundary (10) and the folded boundary (9). The plane boundary (10), the folded boundary (9), and the cover plate boundary (8) are connected by connecting pads. This invention ensures that the paint inside the fairing cavity is not damaged during cover plate installation and facilitates subsequent disassembly and maintenance.

Description

Technical Field

[0001] This invention relates to the field of marine technology, specifically to a azimuth thruster fairing cover structure and its installation method. Background Technology

[0002] Typically, azimuth thrusters are located at the bow and stern of the hull. Due to the unique shape of the thruster base, it cannot perfectly match the sleek outer shell of the hull, necessitating the design of a fairing to accommodate the installation space requirements of the thruster base. After the upper and lower cylinders of the thruster base are connected and installed, a cover plate is sealed at the bottom of the fairing. This facilitates water flow near the propeller, reducing drag and slowing the accumulation of debris around the thruster base.

[0003] The bottom cover plate of the fairing will maintain a certain gap with the lower cylinder of the propeller base. The cover plate is welded and fixed to the bottom of the fairing. Once the cover plate is installed, the paint inside the fairing damaged by the welding of the cover plate cannot be repaired because it cannot be repaired. After the ship is launched, the inside of the fairing will quickly rust and cannot be repaired.

[0004] CN213442941U discloses a propeller fairing, including a guide section and an inclined section connected to each other. The guide section has a first surface and a guide surface disposed opposite to each other, and the distance between the guide surface and the first surface gradually increases in the direction towards the inclined section. The inclined section has a second surface and a mounting surface disposed opposite to each other, and the first surface and the second surface are joined to form a contact surface that can abut to the stern. The distance between the inclined section and the second surface gradually decreases in the direction away from the guide section. A mounting position for mounting the propeller is provided on the mounting surface. The mounting position can be a pre-drilled bolt hole or flange, or a pre-drilled weld hole. However, it is easy to damage the paint when bolted or welded.

[0005] Therefore, a new technical solution is needed to solve the above-mentioned technical problems. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a new azimuth thruster shroud cover plate structure and its installation method that ensures that the paint inside the shroud cavity is not damaged during the installation of the cover plate, while facilitating subsequent disassembly, maintenance and repair.

[0007] To address the above technical problems, this invention provides a azimuth thruster fairing cover structure, comprising an upper cover, a lower cover, and a cover plate. The upper cylinder is fixedly connected to the lower cover via the upper cover. The lower cover is a shell-like structure protruding from the hull plate. A cover plate is provided at the bottom of the lower cover, with a circular hole on the cover plate and a gap between the circular hole and the lower cylinder. The bottom of the lower cover has a planar boundary and a folded boundary, and the cover plate has a cover plate boundary. There are gaps between the cover plate boundary and the planar boundary and the folded boundary. The planar boundary, the folded boundary, and the cover plate boundary are respectively connected by connecting pads.

[0008] By adopting the above technical solution, there is a gap between the lower cover and the cover plate, and there is also a gap between the lower cylinder and the round hole. The planar boundary and the folded boundary of the lower cover are connected to the cover plate boundary respectively, ensuring that the paint inside the guide shroud cavity will not be damaged when the cover plate is installed, and at the same time, it is convenient for later disassembly, maintenance and upkeep.

[0009] Preferably, eight sets of transition pads are provided at adjacent positions of the planar boundary, the folded boundary, and the cover plate boundary, and a connecting pad is provided between each set of transition pads.

[0010] By adopting the above technical solution, the cover plate and the lower cover are connected by connecting the transition plate with the connecting pad, which not only provides sufficient support for the cover plate, but also solves the problem of paint damage.

[0011] Preferably, the connecting pad includes a flat connecting pad and a folded connecting pad.

[0012] By adopting the above technical solution, the straight and curved parts of the cover plate and the lower cover are connected to each other by connecting pads of two forms: flat and folded, making the connection more stable.

[0013] Preferably, the planar connecting pad is fixedly installed under the transition pad adjacent to the planar boundary and the cover plate boundary.

[0014] By adopting the above technical solution, a transition pad is fixed on the plane boundary, and a transition pad is also fixed on the cover plate boundary. The two transition pads are adjacent and connected by a plane connecting pad, which avoids damaging the paint inside the cover plate and the housing when directly welding the connecting pad, thus preventing the paint inside from becoming irreparable.

[0015] Preferably, a folded connecting pad is fixedly installed under the transition pad adjacent to the boundary of the folded surface and the boundary of the cover plate.

[0016] By adopting the above technical solution, a transition pad is fixed on the boundary of the folded surface, and a transition pad is also fixed on the boundary of the cover plate. The two transition pads are adjacent to each other and connected by the folded surface connecting pad. This avoids damaging the paint inside the cover plate and the housing when directly welding the connecting pad, thus preventing the paint inside from becoming irreparable.

[0017] Preferably, the thickness of the transition pad is 15-20mm.

[0018] By adopting the above technical solution, the high temperature generated during welding of the connecting pad can be avoided from damaging the paint inside the cover plate.

[0019] A method for installing a fairing cover structure for a fully azimuth thruster includes the following steps:

[0020] Step 1: The upper cylinder of the azimuth thruster base and the upper cover of the fairing are welded together.

[0021] Step 2: Install transition pads on the edges of the cover plate and the lower cover respectively, and repair the paint inside the lower cover that was damaged by burning the transition pads;

[0022] Step 3: Install the lower cylinder of the thruster base;

[0023] Step 4: Weld flat connecting pads to the adjacent transition pads of the straight section, and weld folded connecting pads to the adjacent transition pads of the arc section to complete the installation of the cover plate and repair the external paint.

[0024] By adopting the above technical solution, the upper cylinder and upper cover are first welded, then the transition pad is installed and the damaged paint is repaired, then the lower cylinder is installed, and finally the flat connecting pad and the folded connecting pad are welded. This installation can completely protect the paint inside and outside the flow guide structure, solving the problem that the paint inside the flow guide cavity cannot be repaired when the cover is installed. Moreover, during the maintenance stage, it is only necessary to cut the weld on the connecting pad to remove the cover for inspection and maintenance. After the work is completed, the connecting pad can be reinstalled. The subsequent disassembly, maintenance and repair are convenient and quick.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1. In this invention, there is a gap between the lower cover body and the cover plate in the flow guide cover structure, and there is also a gap between the lower cylinder body and the round hole. The planar boundary and the folded boundary of the lower cover body are connected to the cover plate boundary respectively, ensuring that the paint inside the flow guide cover cavity will not be damaged when the cover plate is installed, and at the same time, it is convenient for later disassembly, maintenance and upkeep.

[0027] 2. In this invention, eight sets of transition pads are provided at adjacent positions along the planar boundary, the folded boundary, and the cover plate boundary, with connecting pads between each set of transition pads. Connecting the cover plate and the lower housing by linking the transition pads with connecting pads not only provides sufficient support for the cover plate but also solves the problem of paint damage.

[0028] 3. During installation, the upper cylinder and upper cover are first welded together. Then, the transition pad is installed, and any damaged paint is repaired. Next, the lower cylinder is installed. Finally, the flat connecting pad and the folded connecting pad are welded together. By installing each component sequentially, the paint inside and outside the shroud structure can be completely protected. This solves the problem of irreparable paint damage inside the shroud cavity during cover installation. Furthermore, during maintenance, the cover can be removed for inspection and maintenance simply by cutting the weld on the connecting pad. After the work is completed, the connecting pad can be reinstalled, making the process convenient and quick. Attached Figure Description

[0029] Figure 1 This is a side view of the cover plate structure arrangement of the present invention.

[0030] Figure 2 This is a top view of the cover plate structure arrangement of the present invention.

[0031] Figure 3 for Figure 2 A schematic diagram of the AA cross-sectional structure.

[0032] Figure 4 for Figure 2 Schematic diagram of the BB cross-section structure.

[0033] In the figure, 1. cover plate, 2. lower cover body, 3. transition pad, 4. flat connecting pad, 5. folded connecting pad, 6. lower cylinder, 7. upper cylinder, 8. cover plate boundary, 9. folded boundary, 10. flat boundary, 11. round hole, 12. upper cover body. Implementation

[0034] like Figure 1 As shown, a azimuth thruster fairing cover structure mainly consists of an upper cover 12, a lower cover 2, and a cover plate 1. The upper cover 12 is welded to the upper cylinder 7 of the thruster base to form a watertight boundary. At the same time, the upper cover 12 is welded to the lower cover 2 to form a watertight boundary. The lower cover 2 is a shell-like structure protruding from the outer plate of the ship. The cover plate 1 is set at the bottom of the lower cover 2. The cover plate 1 is not connected to the lower cylinder 6 of the thruster base.

[0035] like Figure 2 As shown, the bottom boundary of the lower cover 2 includes a planar boundary 10 and a folded boundary 9, while the cover plate 1 has a cover plate boundary 8. The cover plate boundary 8 of the cover plate 1 is not directly connected to the planar boundary 10 and the folded boundary 9 of the lower cover 2, maintaining a 25mm gap in between. This gap facilitates control of construction precision and prevents larger debris from entering the interior of the guide shield. Eight sets of transition pads 3 are set at adjacent positions between the planar boundary 10 and the folded boundary 9 of the lower cover 2 and the cover plate boundary 8, and eight connecting pads are set between each set of transition pads 3. By connecting the transition pads 3 with the connecting pads, the cover plate 1 and the lower cover 2 are connected, which not only provides sufficient support for the cover plate 1 but also solves the problem of paint damage. The connecting pads include planar connecting pads 4 and folded connecting pads 5. By using both planar and folded connecting pads, the straight and curved parts of the cover plate 1 and the lower cover 2 are connected to each other, making the connection more stable. A circular hole 11 is opened on the cover plate 1. A gap of 25mm is maintained between the lower cylinder 6 of the propeller base and the circular hole 11. This gap can facilitate the control of construction accuracy and prevent larger debris from entering the inside of the guide fairing.

[0036] The novel fairing cover structure of this application is easy and quick to install and maintain. There is a gap between the lower cover 2 and the cover plate 1, and there is also a gap between the lower cylinder 6 and the round hole 11. The planar boundary 10 and the folded boundary 9 of the lower cover 2 are connected to the cover plate boundary 8 of the cover plate 1, ensuring that the paint inside the fairing cavity will not be damaged when the cover plate 1 is installed, and at the same time, it is easy to disassemble and maintain later.

[0037] like Figure 3 As shown, at the straight connection position between the cover plate 1 and the lower cover 2, transition pads 3 are welded to the edges of the plane boundary 10 of the lower cover 2 and the boundary 8 of the cover plate, respectively. The plane connecting pads 4 are welded below the transition pads 3. Every two transition pads 3 are adjacent and connected by the plane connecting pads 4 to avoid damaging the paint inside the cover plate and the cover body when directly welding the connecting pads, thus preventing the paint inside from becoming irreparable.

[0038] like Figure 4 As shown, at the folded connection position between the cover plate 1 and the lower cover 2, transition pads 3 are welded to the edges of the folded boundary 9 of the lower cover 2 and the cover plate boundary 8, respectively. Folded connection pads 5 are welded below the transition pads 3. The folded connection pads 5 are formed by pressing and folding a flat plate at a specified angle. Every two transition pads 3 are adjacent and connected by the folded connection pads 5, avoiding damage to the paint inside the cover plate and the cover body when directly welding the connection pads, thus preventing irreparable paint damage.

[0039] As a transition pad 3, in order to avoid the high temperature generated during welding of the connecting pad 4 from damaging the paint inside the cover plate 1, the thickness of the transition pad 3 needs to reach 15-20mm.

[0040] The installation sequence of this invention is as follows:

[0041] A method for installing a fairing cover structure for a fully azimuth thruster includes the following steps:

[0042] Step 1: The upper cylinder 7 of the azimuth thruster base and the upper cover 12 of the fairing are welded together.

[0043] Step 2: Install transition pads 3 on the edges of cover plate 1 and lower cover 2 respectively, and repair the paint inside the lower cover 2 that was damaged by burning the transition pads 3;

[0044] Step 3: Install the lower cylinder 6 of the thruster base;

[0045] Step 4: Weld flat connecting pads 4 onto the two adjacent transition pads 3 of the straight section, and weld folded connecting pads 5 onto the two adjacent transition pads 3 of the arc section to complete the installation of the cover plate 1 and repair the external paint.

[0046] This application first welds the upper cylinder 7 and the upper cover 12, then installs the transition pad 3 and repairs any damaged paint, then installs the lower cylinder 6, and finally welds the flat connecting pad 4 and the folded connecting pad 5. This installation method ensures complete protection of the paint inside and outside the flow guide structure, solving the problem of irreparable paint damage inside the flow guide cavity during cover plate installation. During maintenance, the cover plate 1 can be removed for inspection and maintenance simply by cutting the welds on the flat connecting pad 4 and the folded connecting pad 5. After the work is completed, the flat connecting pad 4 and the folded connecting pad 5 can be reinstalled, making subsequent disassembly, maintenance, and repair convenient and quick.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A azimuth thruster fairing cover structure, characterized in that: The system includes an upper cover (12), a lower cover (2), and a cover plate (1). The upper cylinder (7) is fixedly connected to the lower cover (2) through the upper cover (12). The lower cover (2) is a shell-like structure protruding from the outer plate of the ship. A cover plate (1) is provided at the bottom of the lower cover (2). A round hole (11) is opened on the cover plate (1). There is a gap between the round hole (11) and the lower cylinder (6). The bottom of the lower cover (2) has a plane boundary (10) and a folded boundary (9). The cover plate (1) has a cover plate boundary (8). There is a gap between the cover plate boundary (8) and the plane boundary (10) and the folded boundary (9). The plane boundary (10), the folded boundary (9) and the cover plate boundary (8) are respectively connected by connecting pads. The planar boundary (10), the folded boundary (9) and the cover plate boundary (8) are provided with eight sets of transition pads (3) at adjacent positions below, and a connecting pad is provided between each set of transition pads (3); The connecting pad includes a flat connecting pad (4) and a folded connecting pad (5); The planar connecting pad (4) is fixedly installed under the transition pad (3) adjacent to the planar boundary (10) and the cover plate boundary (8); A folded connecting pad (5) is fixedly installed under the transition pad (3) adjacent to the folded boundary (9) and the cover plate boundary (8); The thickness of the transition pad (3) is 15-20mm.

2. A method for installing the azimuth thruster fairing cover structure as described in claim 1, characterized in that: Includes the following steps: Step 1: The upper cylinder (7) of the azimuth thruster base and the upper cover (12) of the fairing are welded together; Step 2: Install transition pads (3) on the edges of the cover plate (1) and the lower cover (2) respectively, and repair the paint inside the lower cover (2) that was damaged by burning the transition pads (3); Step 3: Install the lower cylinder of the thruster base (6); Step 4: Weld a flat connecting pad (4) to the two adjacent transition pads (3) of the planar boundary (10) and the cover plate boundary (8), and weld a folded connecting pad (5) to the two adjacent transition pads (3) of the folded boundary (9) and the cover plate boundary (8) to complete the installation of the cover plate (1) and repair the external paint.

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