Shaft-driven engine device driven by free end of main engine and ship with shaft-driven engine device

Abstract

The invention provides a shaft-driven engine device driven by a free end of a main engine and a ship with the same. The shaft-driven engine device driven by the free end of the main engine comprises the main engine, the speed change device is connected with the free end of the table main machine; the plurality of shaft generators are connected to the speed change device in parallel; the sleeve frequency converter is connected with the plurality of shaft generators; the transformer is connected with the frequency converter; and the distribution board is connected with the transformer. A large axle generator is replaced by a plurality of small axle generators, so that the space is reduced, the power generation output is improved, and the technical problem that the marine axle generator cannot be applied to a ship with relatively small tonnage of a ship body is solved.

Description

Technical field:

[0001] The present invention relates to the technical field of ship transmission, in particular to a shaft-belt engine device driven by the free end of a main engine and a ship thereof. Background technology:

[0002] Existing marine shaft generators are mainly used on large ships. However, for medium and long-distance oil tankers of about 50,000 tons, this type of structural design is no longer applicable due to the relatively small hull itself. It is necessary to reduce the space and basically achieve the corresponding performance.

[0003] There is an urgent need for a shaft-belt engine device driven by the free end of a main engine and a ship thereof, which can help solve the technical problem that a marine shaft-belt generator cannot be applied to ships with relatively small hull tonnage. Summary of the invention:

[0004] In one embodiment, the present invention provides a shaft-belt engine device driven by the free end of the main engine, which replaces a large shaft-belt generator with multiple small shaft-belt generators to reduce space and increase power generation output, thereby helping to solve the technical problem that marine shaft-belt generators cannot be used on ships with relatively small hull tonnage.

[0005] The active free-end driven shaft-belt engine device comprises:

[0006] A host;

[0007] a speed change device connected to the free end of the main engine;

[0008] Multiple shaft generators are connected in parallel to the speed change device;

[0009] A set of frequency converters connected to multiple shaft generators;

[0010] a transformer connected to the frequency converter;

[0011] A distribution board is connected to the transformer.

[0012] In one embodiment, the speed change device uses a high-elasticity combined gear box to change the main engine speed to a predetermined speed.

[0013] In one embodiment, the shaft generator is mounted at the free end of the main engine.

[0014] In one embodiment, the frequency converter, transformer, and switchboard adjust the speed, voltage, frequency, and power of the multiple shaft generators to be consistent.

[0015] In one embodiment, the invention is applied to a 50,000-ton long-range oil tanker.

[0016] In one embodiment, a short shaft is used to connect the main engine and the high-elasticity combined gearbox to transmit the main engine power to the shaft-belt generator.

[0017] In one embodiment, the mechanical power generated by the main engine is transmitted to the shaft generator through a speed change device. The shaft generator converts the mechanical power into electrical power and transmits it to the frequency converter, which then supplies power to the distribution board or load through a transformer.

[0018] In one embodiment, the electric power is AC, and the frequency converter converts AC to DC and then DC to AC.

[0019] The present invention also provides a ship, the ship comprising a hull;

[0020] The hull is provided with a shaft-belt engine device driven by the free end of the main engine as described above. Description of the drawings:

[0021] Figure 1 This is a schematic structural diagram of a shaft-belt engine device driven by the free end of the main engine in one embodiment of the present invention.

[0022] Reference numerals

[0023] Host 1

[0024] Speed ​​Shifter 2

[0025] Shaft generator 3

[0026] Inverter 4

[0027] Transformer 5

[0028] Distribution Board 6 Specific implementation method:

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0031] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0032] It should also be understood that although the present application has been described with reference to certain specific examples, those skilled in the art will be able to implement many other equivalent forms of the present application that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0033] The above and other aspects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0034] Specific embodiments of the present application will be described below with reference to the accompanying drawings; however, it should be understood that the embodiments described are merely examples of the present application and may be implemented in a variety of ways. Familiar and / or repetitive functions and structures are not described in detail to clarify the true intent based on the user's historical operations and to avoid obscuring the present application with unnecessary or redundant details. Therefore, the specific structural and functional details described herein are not intended to be limiting, but rather serve merely as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any appropriate detailed structure.

[0035] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," which may all refer to one or more of the same or different embodiments according to the present application.

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0038] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0039] It should also be understood that although the present application has been described with reference to certain specific examples, those skilled in the art will be able to implement many other equivalent forms of the present application that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0040] The above and other aspects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0041] Specific embodiments of the present application will be described below with reference to the accompanying drawings; however, it should be understood that the embodiments described are merely examples of the present application and may be implemented in a variety of ways. Familiar and / or repetitive functions and structures are not described in detail to clarify the true intent based on the user's historical operations and to avoid obscuring the present application with unnecessary or redundant details. Therefore, the specific structural and functional details described herein are not intended to be limiting, but rather serve merely as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any appropriate detailed structure.

[0042] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," which may all refer to one or more of the same or different embodiments according to the present application.

[0043] Against the backdrop of global energy conservation and emission reduction, our company's flagship MR vessel model has been committed to researching energy-saving and emission-reduction technologies. Improving the ship's energy efficiency design index is a constant goal of the shipping industry. Shaft generators can improve the ship's energy efficiency design index by approximately 5 percentage points. However, despite conventional optimization techniques, the application of shaft generators on medium- and long-range oil tankers of approximately 50,000 tons is limited by space. This invention overcomes this spatial limitation for shaft generators on medium- and long-range oil tankers of approximately 50,000 tons, bringing the performance indicators of MR vessels to internationally leading levels.

[0044] Figure 1 FIG. 1 is a schematic diagram of the structure of a shaft-belt engine device driven by the free end of the main engine in one embodiment of the present invention. Figure 1 As shown,

[0045] In one embodiment, the present invention provides a shaft-belt engine device driven by a main engine free end, wherein the shaft-belt engine device driven by an active free end includes:

[0046] One host 1;

[0047] A speed change device 2 connected to the free end of the main engine 1;

[0048] Multiple shaft generators 3 are connected in parallel to the speed change device 2;

[0049] A set of frequency converters 4 connected to the plurality of shaft generators 3;

[0050] a transformer 5 connected to the frequency converter 4;

[0051] A distribution board 6 is connected to the transformer 5 .

[0052] A shaft generator is a device that uses the power of a ship's main propulsion shaft to generate electricity. Typically incorporated into a vessel's auxiliary power system, it can significantly improve fuel efficiency and reduce operating costs. Connected to the ship's main propulsion shaft (propeller shaft) via a gearbox or frequency converter, the shaft generator utilizes a portion of the main engine's power to generate electricity, rather than relying on a separate auxiliary diesel generator. With a gearbox hard-wired to the main shaft, the frequency of generated electricity is directly related to the main engine's speed (either requiring a constant speed or using a variable-speed gearbox).

[0053] Variable frequency shaft-driven generator (PTO / PTI): The frequency is adjusted by a frequency converter (such as an AFE frequency converter) so that the generator can output power stably at different speeds of the main engine.

[0054] In one embodiment, the speed change device 2 uses a high-elasticity combined gear box to change the speed of the main engine 1 to a predetermined speed.

[0055] In one embodiment, the shaft generator 3 is installed at the free end of the main engine 1 .

[0056] In one embodiment, the frequency converter 4 , the transformer 5 , and the switchboard 6 adjust the speed, voltage, frequency, and power of the plurality of shaft generators 3 to be consistent.

[0057] In one embodiment, the invention is applied to a 50,000-ton long-range oil tanker.

[0058] In one embodiment, a short shaft is used to connect the main engine 1 and the high-elastic combination gearbox to transmit the power of the main engine 1 to the shaft-belt generator 3.

[0059] In one embodiment, the mechanical power generated by the host 1 is transmitted to the shaft generator through the speed change device 2. The shaft generator 3 converts the mechanical power into electrical power and transmits it to the inverter 4, and then supplies power to the distribution board 6 or the load through the transformer 5.

[0060] In one embodiment, the electric power is AC, and the frequency converter converts AC to DC and then DC to AC.

[0061] In one embodiment, the present invention further provides a vessel having a shaft-driven engine device driven by a free end of a main engine, the vessel comprising a hull;

[0062] The hull is provided with a shaft-belt engine device driven by the free end of the main engine as described above.

[0063] Detailed explanation of Shaft Generator

[0064] A shaft generator is a device that uses the power of a ship's main propulsion shaft system to generate electricity. It is usually part of a ship's auxiliary power system and can significantly improve fuel efficiency and reduce operating costs.

[0065] How it works

[0066] The shaft generator is connected to the ship's main propulsion shaft (propeller shaft) through a gearbox or frequency converter, using part of the power of the main engine (main engine) to generate electricity instead of relying on an independent auxiliary diesel generator.

[0067] - Mechanical shaft generator: hard-connected to the main shaft through a gearbox, the power generation frequency is directly related to the main engine speed (constant speed or use of a variable speed gearbox is required).

[0068] - Variable frequency shaft-driven generator (PTO / PTI): The frequency is adjusted by a frequency converter (such as an AFE converter) so that the generator can output power stably at different engine speeds.

[0069] Key Benefits

[0070] Energy saving and high efficiency: Utilize the surplus power of the main engine to generate electricity, reduce the operating time of the auxiliary engine, and save fuel (can reduce fuel consumption by 5% to 15%).

[0071] Reduced maintenance: Reduce auxiliary diesel generator operating time, extend their lifespan and reduce maintenance costs.

[0072] Low emissions: Main engines typically burn more efficiently than auxiliary engines, helping to meet environmental regulations such as IMO Tier III.

[0073] Save space: reduce the number of auxiliary engines and optimize the cabin layout.

[0074] Applicable ship types

[0075] -Container ships, bulk carriers, oil tankers (large main engine power, suitable for shaft engines)

[0076] -LNG / LPG carriers (high power demand, shaft generators can optimize energy efficiency)

[0077] - Cruise ships / RoRo passenger ships (requires stable power supply, shaft generator + inverter solution is common)

[0078] 4. Operation Mode

[0079] 1. PTO (Power Take-Off) mode: The main engine drives the propeller and the generator to generate electricity (most common).

[0080] 2.PTI (Power Take-In) mode: The generator can be used as a motor to assist the main engine in propulsion (such as low-speed maneuvers or emergency situations).

[0081] 3. Hybrid mode: Combined with energy storage batteries or diesel-electric systems to optimize power distribution (such as "shaft generator + lithium battery" hybrid ship).

[0082] Key technical challenges

[0083] Speed ​​matching problem: When the host speed changes, the inverter or gearbox is required to maintain constant frequency power output (50Hz / 60Hz).

[0084] Grid-connected control: Needs to be synchronized with the ship's power grid to avoid voltage / frequency fluctuations.

[0085] Redundant design: When a shaft generator fails, a backup generator is required to ensure power supply safety.

[0086] Market Trends

[0087] -Promotion of green shipping: Regulations such as IMO CII and EEXI have prompted more shipowners to adopt shaft engine technology.

[0088] - Hybrid power integration: Shaft generators are combined with lithium batteries and fuel cells to create low-carbon ships.

[0089] -Intelligent control: AI optimizes the load distribution between the main engine and the generator, further improving energy efficiency.

[0090] Shaft generators are a key technology for modern, energy-efficient ships, particularly those with high-power main engines and stable power demands. With tightening environmental regulations and rising fuel costs, their use is expected to become more widespread.

[0091] If you need specific cases (such as the shaft generator configuration of a certain type of ship) or technical details (such as the selection of inverters), please feel free to ask further questions!

[0092] In the marine industry, the "free end of the engine"* refers to the end of the ship's main engine (main engine) that is not connected to the drive shaft or gearbox. It is usually located opposite the main engine's output. This term is primarily used to distinguish between the main engine's power output (drive end) and the non-powered (free end).

[0093] Typical application cases of free end

[0094] -Shaft generator (PTO system):

[0095] The power is taken from the free end through a gearbox or clutch to generate electricity, reducing the operation of auxiliary machines (such as the PTO design of MAN B&W and WinGD main engines).

[0096] -Diesel-electric hybrid propulsion:

[0097] An electric motor can be installed at the free end (PTI mode) to assist the main engine in propulsion during low-speed sailing.

[0098] - Emergency fire pump / air compressor:

[0099] Some ships use free ends to drive emergency equipment to improve system redundancy.

[0100] Technical considerations

[0101] -Torque limitation: The equipment connected at the free end must take into account the torque capacity of the host crankshaft to avoid overload.

[0102] -Vibration control: Additional equipment may affect the balance of the host and require dynamic calibration (such as shock absorber installation).

[0103] -Cooling and lubrication: The free-end equipment must be compatible with the host lubrication system to prevent oil circuit conflicts. Structural design: Clarify the power transmission path and optimize the cabin layout.

[0104] -Safety regulations: Prevent non-power end from being accidentally connected to high-load equipment and causing damage.

[0105] -Energy efficiency management: Reasonable use of the free end can improve the overall energy efficiency (such as waste heat recovery and shaft power generation).

[0106] The main engine free end is the critical non-power side of a ship's main engine, primarily used for auxiliary equipment installation and maintenance. Its proper use can improve the ship's economy and reliability. During modification or design, it must be adapted to the main engine manufacturer's technical specifications.

[0107] If you need a free end configuration example for a specific model (such as a certain type of low-speed two-stroke diesel engine), you can provide further explanation!

[0108] 1. The present invention uses a shaft generator device driven by the free end of the main engine. The shaft generator is installed at the free end of the main engine, which does not affect the shaft system from the main engine to the propeller. This solves the problem of the shaft generator affecting the main engine shaft system.

[0109] 2. The present invention adopts a high-elasticity combined gearbox (referred to as a speed changer) to convert the main engine speed into the speed required by the generator, and at the same time prevents the shaft-belt generator from damaging the main engine through high elasticity.

[0110] 3. The present invention uses a short shaft to connect the main engine and the high elasticity to transmit the main engine power to the shaft-driven generator.

[0111] 4. The present invention adopts a high-elastic demolition method to meet the isolation requirements between the main engine and the shaft generator.

[0112] 5. The present invention combines two small permanent magnet shaft generators into one large shaft generator, which reduces the space requirement of the shaft generator and makes it possible to use the shaft generator on small and medium-sized ships.

[0113] 6. The present invention adopts new variable frequency control technology to combine two permanent magnet shaft-driven generators into a large shaft-driven generator, and ensures that the speed, voltage, frequency and power of the two permanent magnet shaft-driven generators are consistent.

[0114] 1. The present invention adopts a shaft-belt generator device driven by the free end of the main engine and installs the shaft-belt generator at the free end of the main engine. This technology is at the domestic advanced level.

[0115] 2. This invention uses a highly elastic combined gearbox (referred to as a speed changer) to convert the main engine speed to the required generator speed. This high elasticity also prevents damage to the main engine from the shaft-belt generator. This technology is leading in China and at the world's advanced level.

[0116] 3. The present invention uses a short shaft to connect the main engine and the high elasticity to transmit the main engine power to the shaft-belt generator. This technology is at the domestic advanced level.

[0117] 4. The present invention adopts a high-elastic demolition method to meet the isolation requirements between the main engine and the shaft generator. This technology is at the domestic advanced level.

[0118] 5. The present invention combines two small permanent magnet shaft generators into one large shaft generator, which reduces the space requirement of the shaft generator and makes it possible to use shaft generators on small and medium-sized ships. This technology is leading in China and at the world's advanced level.

[0119] 6. The present invention adopts the latest variable frequency control technology to combine two permanent magnet shaft-belt generators into one large shaft-belt generator, and at the same time ensures that the speed, voltage, frequency and power of the two permanent magnet shaft-belt generators driven by the same gear are consistent. This technology is at the leading domestic level and at the world's advanced level.

[0120] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the spirit and scope of protection of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present invention.

Claims

1. A shaft-belt engine device driven by the free end of the main engine, characterized in that: The active free-end driven shaft-belt engine device comprises: A host (1); a speed change device (2) connected to the free end of the main engine (1); A plurality of shaft-belt generators (3) are connected in parallel to the speed change device (2); a set of frequency converters (4) connected to the plurality of shaft-driven generators (3); a transformer (5) connected to the frequency converter (4); A distribution board (6) is connected to the transformer (5).

2. The shaft-belt engine device driven by the free end of the main engine according to claim 1, characterized in that: The speed change device (2) uses a high-elasticity combined gear box to change the rotation speed of the main engine (1) to a predetermined rotation speed.

3. The shaft-belt engine device driven by the free end of the main engine according to claim 2, characterized in that: The shaft generator (3) is mounted on the free end of the main engine (1).

4. The shaft-belt engine device driven by the free end of the main engine according to claim 3, characterized in that: The frequency converter (4), the transformer (5), and the switchboard (6) adjust the rotation speed, voltage, frequency, and power of multiple shaft-driven generators (3) to be consistent.

5. The shaft-belt engine device driven by the free end of the main engine according to claim 4, characterized in that: Applicable to 50,000-ton long-range oil tankers.

6. The shaft-belt engine device driven by the free end of the main engine according to claim 5, characterized in that: A short shaft is used to connect the main engine (1) and the high-elasticity combined gear box, and the power of the main engine (1) is transmitted to the shaft-belt generator (3).

7. The shaft-belt engine device driven by the free end of the main engine according to claim 6, characterized in that: The mechanical power generated by the main engine (1) is transmitted to the shaft generator through the speed change device (2), and the shaft generator (3) converts the mechanical power into electrical power and transmits it to the frequency converter (4), and then supplies power to the distribution board (6) or the load through the transformer (5).

8. The shaft-belt engine device driven by the free end of the main engine according to claim 7, characterized in that: The electric power is AC, and the frequency converter converts AC to DC and then DC to AC.

9. A ship having a shaft-driven engine device driven by the free end of the main engine, characterized in that: The vessel comprises a hull; The hull is provided with a shaft-belt engine device driven by the free end of the main engine as described in any one of claims 1-8.

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