A marine shafting system and a marine vessel

Abstract

The application belongs to the technical field of ship equipment, and discloses a ship shaft system and a ship. The ship shaft system comprises a diesel engine, a four-quadrant motor, a controller and a frequency converter. The output shaft of the four-quadrant motor is connected to the driving end of the diesel engine. The first end of the frequency converter is electrically connected to the four-quadrant motor. The second end of the frequency converter is electrically connected to the ship distribution board through a power cable. The controller is in communication connection with the frequency converter. The controller can control the frequency converter to control the rotating speed and torque of the four-quadrant motor. The ship comprises the above ship shaft system. The ship shaft system provided by the application can effectively save the high-pressure air supply system, the flywheel disc and the turning gear on the existing ship when applied to the ship, effectively simplifies the overall structure of the ship, and can adaptively generate power for the ship, effectively reducing the overall power burden of the ship.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ship equipment, in particular to a ship shaft system and a ship. BACKGROUND

[0002] At present, the low-speed machine in the ship is mainly set as a diesel engine, and is matched with the diesel engine. The ship is also provided with a high-pressure air supply system, a flywheel disc and a turning gear. Specifically, the high-pressure air supply system is used to provide super-high pressure starting air for the diesel engine to assist the diesel engine to start; the flywheel disc is used to increase the torque of the diesel engine; and the turning gear is used to drive the diesel engine to rotate a few rounds when the diesel engine is not started for a long time, so as to ensure that the performance inside the diesel engine before starting meets the requirements. The addition of the high-pressure air supply system, the flywheel disc and the turning gear will increase the corresponding driving components and control components, which will complicate the control system of the ship as a whole. In addition, the addition of the above components will also increase the power consumption of the ship as a whole, which will increase the burden of the power consumption of the ship as a whole. SUMMARY

[0003] The purpose of the present application is to provide a ship shaft system which can effectively simplify the high-pressure air supply system, the flywheel disc and the turning gear on the ship, and can adaptively generate power for the ship.

[0004] To achieve this purpose, the present application adopts the following technical scheme:

[0005] A ship shaft system, comprising:

[0006] a diesel engine;

[0007] a four-quadrant motor, an output shaft of the four-quadrant motor being connected to a driving end of the diesel engine;

[0008] a frequency converter, a first end of the frequency converter being electrically connected to the four-quadrant motor, and a second end of the frequency converter being electrically connected to a ship distribution board through a power transmission cable;

[0009] a controller, the controller being in communication connection with the frequency converter, and the controller being capable of controlling the frequency converter to control the rotating speed and torque of the four-quadrant motor.

[0010] Optionally, the four-quadrant motor is a through-shaft motor, a first end of the output shaft of the four-quadrant motor being connected to the driving end of the diesel engine, and a second end of the output shaft of the four-quadrant motor being connected to a propeller.

[0011] Optionally, a rotating speed and torque sensor is arranged on the four-quadrant motor, and the rotating speed and torque sensor is in communication connection with the controller, and the rotating speed and torque sensor is used to detect the rotating speed and torque of the output shaft of the four-quadrant motor.

[0012] Optionally, a filter is arranged on the power transmission cable between the frequency converter and the ship power distribution board.

[0013] Optionally, a cooling system is further included, and the cooling system includes a water cooling module, the water cooling module includes a refrigerant tank and a cooling pipeline which are in communication, the cooling pipeline is arranged around the four-quadrant motor, and the refrigerant tank is capable of circulating the refrigerant into the cooling pipeline.

[0014] Optionally, the cooling system further includes an air cooling module, and the air cooling module includes a fan which is arranged towards the four-quadrant motor.

[0015] Optionally, the battery is electrically connected with the ship power distribution board through a charging and discharging cable, and a charging and inverting integrated machine is arranged on the charging and discharging cable between the battery and the ship power distribution board.

[0016] Optionally, the first end of the output shaft of the four-quadrant motor is connected with the driving end of the diesel engine through a first coupling.

[0017] Optionally, the second end of the output shaft of the four-quadrant motor is connected with the propeller through a second coupling.

[0018] A ship includes the ship shaft system according to any one of the above.

[0019] Advantages:

[0020] The ship shaft system provided by the application is characterized in that the output shaft of the four-quadrant motor is connected with the diesel engine, the first end of the frequency converter is electrically connected with the four-quadrant motor, the second end of the frequency converter is electrically connected with the ship distribution board through the power cable, the controller is in communication connection with the frequency converter and can control the frequency converter to control the rotating speed and torque of the four-quadrant motor. When the diesel engine needs to be turned, the controller controls the frequency converter to drive the output shaft of the four-quadrant motor to rotate slowly, so as to drive the driving end of the diesel engine to rotate synchronously, thereby achieving the turning of the diesel engine, and the turning device can be omitted. When the diesel engine needs to be started formally, the controller controls the frequency converter to drive the output shaft of the four-quadrant motor to rotate quickly, so as to drive the driving end of the diesel engine to reach the ignition speed of the internal cylinder, and then the diesel engine is ignited to start formally, thereby the high-pressure air supply system can be omitted. In addition, when the diesel engine is started formally, the output shaft of the four-quadrant motor can be driven to rotate, and the controller controls the frequency converter to add a torque to the four-quadrant motor, which is opposite to the rotating direction of the output shaft, thereby achieving the function of the flywheel disc, the flywheel disc can be omitted, the four-quadrant motor can function as a generator to generate electricity, and the generated electricity can be transmitted to the ship distribution board through the frequency converter, thereby reducing the electricity consumption and effectively reducing the overall power burden of the ship. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural layout schematic diagram of the ship shaft system of the application.

[0022] In the drawings:

[0023] 100, diesel engine; 200, four-quadrant motor; 210, first coupling; 220, second coupling; 300, frequency converter; 400, ship distribution board; 500, controller; 600, propeller; 700, filter; 800, cooling system; 810, refrigerant tank; 820, cooling pipeline; 830, fan; 900, battery; 910, charging and inverting integrated machine. DETAILED DESCRIPTION

[0024] The application will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the application, but not to limit the application. In addition, it should be noted that, for the convenience of description, only the parts related to the application are shown in the drawings, but not all the structures.

[0025] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0027] In the description of the present embodiment, the terms "up", "down", "right", and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0028] The present embodiment provides a ship shaft system, referring to Figure 1 The ship shaft system includes a diesel engine 100, a four-quadrant motor 200, a frequency converter 300 and a controller 500, wherein the output shaft of the four-quadrant motor 200 is connected to the driving end of the diesel engine 100, the first end of the frequency converter 300 is electrically connected with the four-quadrant motor 200, the second end of the frequency converter 300 is electrically connected with the ship distribution board 400 through power transmission cable, the controller 500 is in communication connection with the frequency converter 300, and the controller 500 can control the frequency converter 300 to control the speed and torque of the four-quadrant motor 200.

[0029] In the embodiment, when the diesel engine 100 needs to be cranked, the controller 500 controls the frequency converter 300 to drive the output shaft of the four-quadrant motor 200 to rotate slowly, so as to drive the driving end of the diesel engine 100 to rotate synchronously, thereby achieving the cranking of the diesel engine 100, and the setting of the cranking device can be omitted; when the diesel engine 100 needs to be started formally, i.e., when the ship shaft drive system needs to be switched to the PTI (POWER-TAKE-IN) mode, the controller 500 controls the frequency converter 300 to drive the output shaft of the four-quadrant motor 200 to rotate quickly, so as to drive the driving end of the diesel engine 100 to reach the ignition speed of the internal cylinder of the diesel engine 100, and then the diesel engine 100 is ignited to start formally, thereby the high-pressure air supply system can be omitted; in addition, after the diesel engine 100 is started formally, it can drive the output shaft of the four-quadrant motor 200 to rotate, when the ship shaft drive system needs to be switched to the PTO (POWER-TAKE-OFF) mode, the controller 500 controls the frequency converter 300 to add a torque to the four-quadrant motor 200, which is opposite to the rotation direction of the output shaft of the four-quadrant motor 200, thereby achieving the function of the flywheel disc, the setting of the flywheel disc can be effectively omitted, the four-quadrant motor 200 can function as a generator to generate electricity, and the generated electricity can be transmitted to the ship distribution board 400 through the frequency converter 300, thereby reducing the power consumption and effectively reducing the overall power burden of the ship.

[0030] The ship shaft drive system provided by the embodiment can effectively omit the high-pressure air supply system, the flywheel disc and the cranking device on the existing ship when applied to the ship, effectively simplifies the overall structure of the ship, and can adaptively generate electricity for the ship, thereby effectively reducing the overall power burden of the ship.

[0031] In the embodiment, the controller 500 is in communication connection with the diesel engine 100, and the controller 500 is adapted to ignite the diesel engine 100 when the driving end of the diesel engine 100 reaches the ignition speed of the internal cylinder of the diesel engine 100. The specific process is the prior art, which will not be described in detail here.

[0032] In the embodiment, the frequency converter 300 can control the four-quadrant motor 200 to operate in the four-quadrant working condition. Specifically, when the rotational speed of the output shaft of the four-quadrant motor 200 is the same as the torque received, i.e., the output shaft of the four-quadrant motor 200 is in the condition of accelerating positive rotation or accelerating reverse rotation, at this time, the power of the four-quadrant motor 200 is supplied by the ship power distribution board 400, and the four-quadrant motor 200 consumes electric energy; when the rotational speed of the output shaft of the four-quadrant motor 200 is opposite to the torque received, i.e., the output shaft of the four-quadrant motor 200 is in the condition of decelerating positive rotation or decelerating reverse rotation, at this time, the four-quadrant motor 200 functions as a generator and generates electricity, and the generated electricity is transmitted to the ship power distribution board 400 through the frequency converter 300, and is used to supply power to other electric equipment on the ship.

[0033] In the embodiment, the four-quadrant motor 200 is set as a synchronous separately excited motor with a rated power of 1.5 MW and a rated voltage of 690 V, the frequency converter 300 is set as a frequency converter with a rated power of 1.5 MW and a rated voltage of 690 V, the AFE is preferably a front-end frequency converter, and the controller 500 controls the frequency converter 300 to control the four-quadrant motor 200 to work in the corresponding quadrant working state, which are all prior arts and will not be described in detail here.

[0034] Further, the four-quadrant motor 200 is set as a through-shaft motor, the first end of the output shaft of the four-quadrant motor 200 is connected to the driving end of the diesel engine 100, and the second end of the output shaft of the four-quadrant motor 200 is connected to the propeller 600. In the embodiment, the diesel engine 100 and the propeller 600 are respectively connected to the two ends of the output shaft of the four-quadrant motor 200, the driving end of the diesel engine 100 rotates, drives the propeller 600 to rotate through the output shaft of the four-quadrant motor 200, and thus plays a role of propelling the ship to sail.

[0035] Specifically, the first end of the output shaft of the four-quadrant motor 200 is connected to the driving end of the diesel engine 100 through the first coupling 210. The second end of the output shaft of the four-quadrant motor 200 is connected to the propeller 600 through the second coupling 220. The coupling is a reliable and efficient torque transmission device, has high sensitivity, high transmission efficiency, long service life, good damping performance, good corrosion resistance, and is widely used in the connection of shafts.

[0036] Further, the four-quadrant motor 200 is provided with a rotating speed and torque sensor (not shown) in communication with the controller 500, which is used to detect the rotating speed and torque of the output shaft of the four-quadrant motor 200. The controller 500 can receive the rotating speed and torque of the output shaft of the four-quadrant motor 200 during operation through the rotating speed and torque sensor, and the controller 500 is also in communication with a display device (not shown), which can display the received rotating speed and torque in real time. The relevant operating personnel can observe the real-time working condition of the four-quadrant motor 200 by observing the display device.

[0037] Further, a filter 700 is arranged on the power transmission cable between the frequency converter 300 and the ship power distribution board 400, which can filter and rectify the electrical signals on the power transmission cable. In this embodiment, the filter 700 is an LCL filter, and THDu (total harmonic distortion of voltage) < 5%. The filter 700 is a prior art and will not be described in detail here.

[0038] Further, the ship shaft system further comprises a battery 900, which is electrically connected to the ship power distribution board 400 through a charging and discharging cable, and a charging and inverting integrated machine 910 is arranged on the charging and discharging cable between the battery 900 and the ship power distribution board 400. By arranging the battery 900 and the charging and inverting integrated machine 910, when the electrical energy on the ship power distribution board 400 is greater than the consumed electrical energy of each ship electrical equipment, the surplus electrical energy on the ship power distribution board 400 can be stored into the battery 900 through the charging and inverting integrated machine 910 to store electrical energy. When the ship electrical energy is tight, the stored electrical energy in the battery 900 is transmitted to the ship power distribution board 400 through the charging and discharging cable through the charging and inverting integrated machine 910 to realize reliable and stable ship power supply.

[0039] In this embodiment, the capacity of the battery 400 is set to 0.7MW lithium battery, which is divided into two groups and respectively assembled into two battery compartments of the ship.

[0040] The charging and inverting integrated machine 910 is a prior art and will not be described in detail here.

[0041] In this embodiment, the ship shaft system further comprises a cooling system 800, which comprises a water cooling module, the water cooling module comprising a refrigerant tank 810 and a cooling pipeline 820 in communication, the cooling pipeline 820 being arranged around the four-quadrant motor 200, and the refrigerant tank 810 being capable of circulating and passing refrigerant into the cooling pipeline 820. The cooling pipeline 820 is arranged around the four-quadrant motor 200, and after the refrigerant tank 810 circulates and passes refrigerant into the cooling pipeline 820, it can effectively absorb the heat generated by the four-quadrant motor 200, effectively cool the four-quadrant motor 200, and ensure that the four-quadrant motor 200 can run at full load for a long time.

[0042] In the embodiment, a circulating pump (not shown) is arranged on the cooling pipeline 820, so as to realize the circulating flow of the refrigerant.

[0043] In the embodiment, the refrigerant is preferably cooling water.

[0044] Further, the cooling system 800 further comprises an air cooling module, which comprises a fan 830 arranged towards the four-quadrant motor 200. The fan 830 can provide air cooling for the four-quadrant motor 200, and further guarantees the cooling effect of the four-quadrant motor 200 in cooperation with the cooling pipeline 820. The reliability and effectiveness of the cooling are guaranteed.

[0045] The embodiment further provides a ship, which comprises the ship shaft belt system. The ship shaft belt system is applied to the ship, so that all the beneficial effects of the ship shaft belt system can be achieved, and details are not described herein.

[0046] Obviously, the above embodiment of the present application is merely an example for clearly explaining the present application, and is not a limitation on the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A ship shafting system, characterized in that, include: Diesel engine (100); A four-quadrant motor (200) is connected to the drive end of the diesel engine (100) via its output shaft. A frequency converter (300) is provided, the first end of which is electrically connected to the four-quadrant motor (200), and the second end of which is electrically connected to the ship's power distribution board (400) via a power transmission cable. A controller (500) is communicatively connected to the frequency converter (300). The controller (500) is able to control the frequency converter (300) so that the frequency converter (300) controls the speed and torque of the four-quadrant motor (200). When the diesel engine (100) is rotated, the controller (500) controls the frequency converter (300) so that the frequency converter (300) drives the output shaft of the four-quadrant motor (200) to rotate slowly, thereby driving the drive end of the diesel engine (100) to rotate synchronously, thus realizing the rotation operation of the diesel engine (100), thereby eliminating the need for a rotation device; When the diesel engine (100) is officially started, the controller (500) controls the frequency converter (300) to drive the output shaft of the four-quadrant motor (200) to rotate rapidly, thereby driving the drive end of the diesel engine (100) to reach the ignition speed of its internal cylinders, and then igniting the diesel engine (100) to officially start the diesel engine, thereby eliminating the need for a high-pressure air supply system; When the diesel engine (100) is started, it can drive the output shaft of the four-quadrant motor (200) to rotate. At this time, the controller (500) controls the frequency converter (300) to add a torque to the four-quadrant motor (200) in the opposite direction of its output shaft rotation, realizing the function of the flywheel. This effectively eliminates the need for a flywheel and allows the four-quadrant motor (200) to act as a generator and generate electricity. The generated electrical energy can be transmitted to the ship's power distribution board (400) via the frequency converter (300). The four-quadrant motor (200) is configured as a through-shaft motor. The first end of the output shaft of the four-quadrant motor (200) is connected to the drive end of the diesel engine (100), and the second end of the output shaft of the four-quadrant motor (200) is connected to the propeller (600).

2. The ship shaft belt system according to claim 1, characterized in that, The four-quadrant motor (200) is equipped with a speed and torque sensor, which is connected in communication with the controller (500). The speed and torque sensor is used to detect the speed and torque of the output shaft of the four-quadrant motor (200).

3. The ship shaft belt system according to claim 1, characterized in that, A filter (700) is installed on the power transmission cable between the frequency converter (300) and the ship's power distribution board (400).

4. The ship shaft belt system according to claim 1, characterized in that, It also includes a cooling system (800), which includes a water-cooled module. The water-cooled module includes a refrigerant tank (810) and a cooling pipe (820) connected in series. The cooling pipe (820) is arranged around the four-quadrant motor (200). The refrigerant tank (810) can circulate refrigerant into the cooling pipe (820).

5. The ship shaft belt system according to claim 4, characterized in that, The cooling system (800) also includes an air-cooled module, which includes a fan (830) positioned toward the four-quadrant motor (200).

6. The ship shaft belt system according to claim 1, characterized in that, It also includes a battery (900), which is electrically connected to the ship's power distribution board (400) via a charging and discharging cable, and a charging inverter integrated machine (910) is provided on the charging and discharging cable between the battery (900) and the ship's power distribution board (400).

7. The ship shaft belt system according to claim 1, characterized in that, The first end of the output shaft of the four-quadrant motor (200) is connected to the drive end of the diesel engine (100) via a first coupling (210).

8. The ship shaft belt system according to claim 1, characterized in that, The second end of the output shaft of the four-quadrant motor (200) is connected to the propeller (600) via a second coupling (220).

9. A ship, characterized in that, Includes the ship shaft belt system as described in any one of claims 1-8.

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