A large permanent magnet shaft generator out-of-cabin method

Abstract

The application provides a large permanent magnet shaft generator out-of-cabin method, which comprises the following steps: optimizing cabin room and equipment arrangement, reserving a lower platform out-of-cabin ship body structure space; planning an out-of-cabin route according to the reserved out-of-cabin ship body structure space; and hoisting the permanent magnet shaft generator according to the planned out-of-cabin route. The application only needs to cut the structure of the lower platform and the outer plate of the ship body, has little influence on the ship body structure, and can hoist the shaft generator out of the cabin with the cooperation of a crane on the wharf without entering the dock, thereby meeting the requirement of configuring the permanent magnet shaft generator in the cabin of a conventional MR ship without affecting the cabin capacity.

Description

Technical Field

[0001] This invention belongs to the field of ship design technology, specifically relating to a method for launching a large permanent magnet shaft generator from the ship's cabin. Background Technology

[0002] With the global pursuit of green and environmentally friendly practices, shaft-driven generators are being used more and more widely in the shipbuilding and marine engineering industries. Conventional liquid cargo ships, bulk carriers, and container ships all require the installation of shaft-driven generators. For ships of around 50,000 tons (referred to as MR ships), considering the limitations of space and cost, configuring permanent magnet shaft-driven generators has become the most cost-effective solution.

[0003] However, due to the characteristics of permanent magnets, they cannot be disassembled inside the nacelle and transported outside for repair like traditional shaft-driven generators; subsequent maintenance and disassembly require very high environmental standards, and the possibility of returning to the factory for repair must also be considered, which poses a severe challenge to the already compact nacelle space structure. Summary of the Invention

[0004] To address the technical problems existing in the prior art, the present invention provides a method for removing a large permanent magnet shaft-driven generator from its enclosure, comprising the following steps:

[0005] Optimize the layout of the engine room and equipment, and reserve space for the hull structure to exit the lower platform;

[0006] Plan the exit route based on the reserved space in the hull structure for exiting the cabin;

[0007] The permanent magnet shaft generator was hoisted along the planned exit route.

[0008] Furthermore, based on the reserved space in the hull structure for exiting the cabin, the planned exit route specifically includes the following steps:

[0009] A hole is drilled at the first designated position on the lower platform, and the permanent magnet shaft-driven generator is hoisted to the lower platform of the engine room through the first designated position;

[0010] Move the permanent magnet shaft generator from the first designated position on the lower platform of the nacelle to the second designated position;

[0011] A hole is made at the third designated position on the outer plating of the ship, and the permanent magnet shaft-driven generator is moved from the second designated position to the third designated position to the outside of the cabin.

[0012] Furthermore, the space of the lower platform's outboard hull structure is located in the reserved space between the port side machine repair bay and the MGO compartment.

[0013] Furthermore, the first designated position is located at the edge of the reserved space.

[0014] Furthermore, the second designated location is located at the starting point of the reserved space.

[0015] Furthermore, the third designated position is located at the end of the reserved space, and the third designated position is located on the hull plating on the left side of the hull.

[0016] Furthermore, the hoisting of the permanent magnet shaft generator according to the planned exit route includes:

[0017] Step 1: Disengage the high-elasticity spring and use a hand chain hoist to move the permanent magnet shaft generator towards the bow to below the first designated position. At this time, the permanent magnet shaft generator is facing the left edge of the first designated position.

[0018] Step 2: Use a chain hoist to lift the permanent magnet shaft generator upwards, around the distribution box located on its side, and then move it to the starboard side until the permanent magnet shaft generator is directly below the first position;

[0019] Step 3: Use a chain hoist to lift the permanent magnet shaft generator vertically upwards and pass it through the first position. At this time, the permanent magnet shaft generator reaches the lower platform.

[0020] Step 4: Use a chain hoist to move the permanent magnet shaft generator to the port side to the bulkhead of the MGO compartment, and then move it to the stern to the second designated position. At this time, the permanent magnet shaft generator will reach the reserved space.

[0021] The fifth step is to lay temporary steel rails in the reserved space, and make holes in the outer plate of the ship at the end of the steel rails. Then, place the permanent magnet shaft generator on the steel rails and move it to the port side to exit the cabin. At this time, the permanent magnet shaft generator has moved to the third designated position to exit the cabin.

[0022] Furthermore, the layout of the cabin equipment needs to reserve a hoisting path in advance. If it cannot be avoided, these equipment need to be designed to be detachable or easy to disassemble.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] This invention, through optimized layout, requires only cutting of two structural parts during disassembly, inspection, and hoisting, resulting in minimal impact on the hull structure. Simultaneously, it allows the generator shaft to be lifted out of the engine room at the dock using a crane, eliminating the need for dry-docking. This also meets the requirement of conventional MR vessels to configure permanent magnet shaft-driven generators in the engine room without affecting cabin capacity. Attached Figure Description

[0025] Figure 1 This is a schematic diagram I of the principle of the present invention (corresponding to steps 1-3, top view);

[0026] Figure 2 This is a schematic diagram II of the principle of the present invention (corresponding to steps 1-3, side view);

[0027] Figure 3 This is a schematic diagram III of the principle of the present invention (corresponding to steps 4-5, top view);

[0028] Figure 4 This is a schematic diagram IV of the principle of the present invention (corresponding to steps 4-5, stern view). Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] In this embodiment, the permanent magnet shaft generator is located at the free end of the main engine. After being lifted, it will exit the engine room through the aft wall of the MGO (oil and water tank) on the port side of the lower platform. By optimizing the layout of the engine room and equipment, a space in the hull structure for the permanent magnet shaft generator to exit the engine room is reserved in the aft wall of the MGO tank on the lower platform for the arrangement of small equipment. The equipment arrangement should reserve the hoisting path of the permanent magnet shaft generator as far in advance as possible. If it cannot be avoided, these devices need to be designed to be detachable or easy to disassemble.

[0031] In the early design stage: considering that if the height of the permanent magnet shaft generator exiting the hull is too low (close to the light load waterline), it must be exited in the dry dock, which will greatly increase the construction cost. In order to expand the applicability of the solution, it is necessary to design the exit from the hull as high as possible, so as to meet the requirement of transporting the permanent magnet shaft generator out while it is berthed. According to the compartment division restrictions of the MR ship, the optimal height is on the lower platform.

[0032] Reference Figures 1-4 The method for removing a large permanent magnet shaft-driven generator from its enclosure provided by this invention includes the following steps:

[0033] Step 1: During the compartment division stage, an equipment layout area that extends directly to the hull plating needs to be reserved on the lower platform near the oil tank bulkhead. The size of the space needs to be sufficient for the hoisting of the permanent magnet shaft generator.

[0034] Step 2: Disengage the high elasticity and use four hand chain hoists to move the permanent magnet shaft generator toward the bow of the ship until the edge of the gap between the permanent magnet shaft generator and the platform structure and equipment arrangement is directly above the generator.

[0035] Step 3: Use four chain hoists to lift the permanent magnet shaft generator vertically upwards, around the distribution box located on its side, and then move it to the starboard side until the permanent magnet shaft generator is located at the edge of the main engine opening on the lower platform;

[0036] Step 4: Use four chain hoists to lift the permanent magnet shaft carrying the generator upwards and pass it through the lower platform (the lower platform needs to have holes cut in advance for the permanent magnet shaft carrying the generator to pass through);

[0037] Step 5: Use four hand chain hoists to move the permanent magnet shaft generator to the port side to the edge of the MGO compartment bulkhead, and then move it to the stern to the pre-reserved equipment arrangement area that runs straight through the hull plating.

[0038] Step 6: Dismantle the equipment in the equipment layout area and lay temporary steel rails. Place the permanent magnet shaft generator on the steel rails and move it to the port side to exit the cabin (cut holes in advance on the port side hull plating corresponding to the end of the steel rails for the permanent magnet shaft generator to pass through).

[0039] This application transforms the excitation generator into a permanent magnet generator, offering significant advantages in cost and space. Compared to the excitation generator, the permanent magnet generator eliminates the need for excitation windings and other structural components, resulting in a more compact structure and reduced excitation energy consumption. Furthermore, permanent magnet motors are better suited for low-speed operation in low-speed machines. The proposed solution of removing the entire unit from the maintenance bay provides a better maintenance environment and facilitates troubleshooting.

[0040] In summary, these are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the specification are within the scope of the present invention.

Claims

1. A method for removing a large permanent magnet shaft-driven generator from its enclosure, characterized in that, Includes the following steps: Optimize the layout of the engine room and equipment, and reserve space for the hull structure to exit the lower platform; Plan the exit route based on the reserved space in the hull structure for exiting the cabin; The permanent magnet shaft generator was hoisted according to the planned exit route. Based on the reserved space in the hull structure for exiting the cabin, the specific steps for planning the exit route include: A hole is drilled at the first designated position on the lower platform, and the permanent magnet shaft-driven generator is hoisted to the lower platform of the engine room through the first designated position; Move the permanent magnet shaft generator from the first designated position on the lower platform of the nacelle to the second designated position; A hole is made at the third designated position on the outer plating of the ship, and the permanent magnet shaft-driven generator is moved from the second designated position to the third designated position to the outside of the cabin; The space for the lower platform to exit the hull structure is the reserved space between the port side machine repair shop and the MGO compartment. The transport of the permanent magnet shaft generator according to the planned exit route includes: Step 1: Disengage the high-elasticity spring and use a hand chain hoist to move the permanent magnet shaft generator towards the bow to below the first designated position. At this time, the permanent magnet shaft generator is facing the left edge of the first designated position. Step 2: Use a chain hoist to lift the permanent magnet shaft generator upwards, around the distribution box located on its side, and then move it to starboard until the permanent magnet shaft generator is directly below the first designated position; Step 3: Use a chain hoist to lift the permanent magnet shaft generator vertically upwards and pass it through the first designated position. At this time, the permanent magnet shaft generator reaches the lower platform. Step 4: Use a chain hoist to move the permanent magnet shaft generator to the port side to the bulkhead of the MGO compartment, and then move it to the stern to the second designated position. At this time, the permanent magnet shaft generator will reach the reserved space. Step 5: Lay temporary steel rails in the reserved space, and make holes in the outer plate of the ship at the end of the steel rails. Then place the permanent magnet shaft generator on the steel rails and move it to the port side to exit the cabin. At this time, the permanent magnet shaft generator has moved to the third designated position to exit the cabin.

2. The method according to claim 1, characterized in that: The first designated position is located at the edge of the reserved space.

3. The method according to claim 2, characterized in that: The second designated location is located at the starting point of the reserved space.

4. The method according to claim 3, characterized in that: The third designated position is located at the end of the reserved space, and the third designated position is located on the outer plating of the ship's left side.

5. The method according to any one of claims 1-4, characterized in that: The layout of the engine room equipment needs to reserve a hoisting path in advance. If it is impossible to avoid, the equipment needs to be designed to be detachable or easy to disassemble.

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