JPS6130959B2 - - Google Patents

Description

[Detailed description of the invention]

A marine propulsion system that connects a shaft generator directly to the propeller shaft or main engine, supplies power to this shaft generator from another inboard generator, operates it as an electric motor, and uses this power to rotate and propel the propeller. It has always been hot. In fixed pitch propeller ships, in order to freely control the ship's speed, the rotational speed of the main engine must be continuously controlled, and as a result, a stationary frequency converter, usually called a separately excited thyristor inverter, is required. When a separately excited thyristor inverter is used, a synchronous phase modifier is required to supply reactive power, which increases the cost. Moreover, even when the main engine speed was stable, waveform distortion and efficiency reduction were unavoidable due to the use of a frequency converter. In addition, on a variable pitch propeller ship, if you operate the main engine at the same constant rotation speed as when sailing on the ocean and try to obtain a low ship speed just by changing the propeller pitch, even a small change in pitch will have a large effect on the ship speed. It is difficult to do so, and the loss is also large, so from the safety point of view,
In sea areas where low ship speed is required, such as in ports, it is better to have the main engine at low speed, and it is preferable to control the main engine at two speeds, high and low. Since it was designed to obtain power at a constant frequency depending on the side, it had the disadvantage that the shaft generator could not be used on the low speed side. The present invention relates to an improvement of a propeller boat propulsion device that eliminates such drawbacks, and in a propeller boat driven by a main engine in a detachable manner, two of the main engines are connected to each other.
Each shaft end of one of two AC rotating machines having a synchronous rotation speed corresponding to each type of speed is connected to the output side of the main engine via a clutch, respectively, and each shaft of the other AC rotating machine is connected to the output side of the main engine through a clutch. A prime mover is connected to each end via a clutch, and the terminals of both AC rotating machines are switched to a frequency converter/circuit with a circuit breaker and a circuit with a circuit breaker connected to the ship's power supply bus via a changeover switch. It is characterized by being able to connect, and its purpose is to:
The object of the present invention is to provide a propulsion device that can be operated efficiently in an optimal operation mode in response to various situations. As described above, in a propeller ship that is removably driven by a main engine, each shaft end of one of two AC rotating machines each having a synchronous rotation speed corresponding to two types of speeds of the main engine is provided. each connected to the output side of the main engine via a clutch,
A prime mover is connected to each shaft end of the other AC rotating machine via a clutch, and each terminal of the AC rotating machine is connected to an inboard power supply bus via a changeover switch. Since the motor and the frequency converter are switchably connected to a circuit with a circuit breaker and a circuit with a circuit breaker, the combinations of stopping the operation of the prime mover and frequency converter, switching the changeover switch, engaging and disengaging the clutch, and opening and closing the circuit breaker can be set in various situations. It is possible to select the appropriate mode accordingly and operate efficiently in the optimum operating mode. The present invention will be described below with reference to the illustrated embodiment. Reference numeral 1 denotes a main propulsion engine, which is connected to the input side of a gear train or other transmission mechanism 3 via a removable power coupling device 2. The output side of the gear device (hereinafter other transmission mechanisms will be omitted) 3 is connected to a variable pitch propeller or a fixed pitch propeller 4. In addition, 5 and 6 are prime movers for the generator, and 7 and 8 are AC rotating machines that can be used as shaft generators or independent generators.
Among the AC rotating machines 7 and 8, the AC rotating machine 8 can also be used as a propulsion electric motor. One end of the one AC rotating machine 7 is connected to the generator prime mover 5 via a clutch 9, and the other end of the rotating machine 7 is connected to the gear system 3 via a clutch 10. One end of the AC rotating machine 8 is connected to the generator prime mover 6 via a clutch 11, and the other end of the rotating machine 8 is connected to the gear system 3 via a clutch 12. Further, the generator prime mover 13 is connected to an independent generator 14 . Further, each terminal of the AC rotating machines 7 and 8 is connected to one terminal 15a and 15b of a changeover switch 15, respectively, and the other terminal 1 of the changeover switch 15 is
5c and 15d are circuits 16 and 17 with a stationary frequency converter and a circuit breaker 17, which are called separately excited thyristor inverters, and circuits with a circuit breaker, which are equipped with only a circuit breaker 18, respectively. The circuit 18 is connected to a power supply bus 20 for supplying power to the ship's loads, and the one terminal 15a, 15b is connected to the circuit 16, 17 with a frequency converter/breaker via the changeover switch 15, and the circuit breaker. They are alternately connected to the attached circuit 18. Further, the independent generator 14 is connected to the power supply bus 20 via a circuit breaker 19. Therefore, in the case of two-speed control of a variable pitch propeller ship, the synchronous rotation speed of the AC rotating machines 7 and 8 is
When the main engine 1 is operating at high speed, the AC rotating machine 7 is at 900 rpm, and when the main engine 1 is operating at low speed, the AC rotating machine 8 is at 900 rpm.
In the case of a fixed pitch propeller ship, the synchronous rotation speed of the AC rotary machine 7 corresponds to the normal rotation speed during normal navigation, and the synchronous rotation speed of the AC rotary machine 8 is set to an appropriate value lower than that. , for example, are set corresponding to 80% of the normal rotation speed of the main engine 1. Since the illustrated embodiment is configured as described above, it can take the following operating modes.

【table】

[Table] Next, to explain each operation mode, the operation mode is a shaft generator system during normal voyage, in which the clutch 10 is engaged and the other clutches 9,
11 and 12, the rotating machine 7 generates AC power with an undefined frequency that corresponds to the rotation of the propeller shaft that varies within a predetermined range, and this is converted into AC power with a constant voltage and constant frequency via the frequency converter 16. The AC rotating machine 8 is supplied to the bus bar 20, and at this time the AC rotating machine 8 is operated as a synchronous phase modifier. In addition, the operation mode is normally a shaft generator system during voyage, but if the sea conditions are calm during voyage, the propeller 4 rotates at a stable and approximately constant rotation speed, so the frequency converter 16 is not used and the shaft generator system is used. generator 7
can be directly applied to the power supply bus 20, and power can be supplied without deterioration in efficiency, waveform distortion, or reliability. Furthermore, in an operation mode that uses a shaft generator system to reduce the speed of the ship for safety reasons such as in ports and narrow waterways, the operation mode changeover switch 15 is connected, the two rotating machines 7 and 8 are activated,
Engagement and disengagement of clutches 10 and 12, frequency conversion device 16
The connections have been swapped. Furthermore, when navigating at a stable low speed in a port or through a narrow waterway, it is sufficient to select the driving mode, and this can be done by changing the driving mode in the same way as changing the driving mode to the driving mode. The operating mode is therefore an auxiliary electric propulsion system in case the main engine 1 is malfunctioning. That is, the AC rotating machine 8 is synchronized with the low rotation side of the main engine 1.
is used as a propulsion electric motor, the input and output of the frequency converter 16 are reversed to control the speed of the electric motor 8, and the AC rotary machine 7 is made independent as a generator, and it is operated alone or in parallel with another generator 14 to generate electric power. electric motor 8
The propeller 4 is supplied to propel the propeller 4. In this case, the main engine 1 is disconnected by the power coupling device 3. In the driving mode, the propulsion motor 8 is further boosted by the prime mover 6 from the opposite side, and a larger output can be obtained than in the driving mode. Furthermore, the operation mode is for using it as an independent generator, and it can be operated as an independent onboard generator by cutting off the relationship with the propeller shaft, regardless of whether it is at sea or at anchor. In this way, in the above-mentioned embodiment, regardless of whether it is a normal voyage or a low-speed navigation such as in a port or a narrow waterway, cheap heavy oil can be used instead of operating the generator motors 5 and 6 that require expensive diesel oil. Since only the main engine 1, which is sufficient for this purpose, can drive either of the AC rotary machines 7 and 8 as a shaft generator, fuel costs can be greatly reduced. Furthermore, since the two AC rotary machines 7 and 8 can be used as shaft generators, even if the rotational speed of the main engine 1 fluctuates over a wide range, it is possible to obtain power at a constant frequency with these two shaft generators. can. Furthermore, if the main engine 1 is in an abnormal state, the operation mode is selected to enable supplementary electric propulsion, further improving the reliability of the vessel. Furthermore, since each of the above-mentioned devices is rationally used as having not only one function but many functions, the equipment cost is low even though it can be operated in various modes. Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

The drawing is a schematic diagram illustrating an embodiment of a propeller boat propulsion device according to the present invention. 1... Main propulsion engine, 2... Power coupling device, 3
... Gear device, 4 ... Propeller, 5, 6 ... Prime mover for generator, 7, 8 ... AC rotating machine, 9, 10,
11, 12...Clutch, 13...Motor for generator, 14...Independent generator, 15...Selector switch, 16...Static frequency converter, 17,1
8, 19... Breaker, 20... Power bus.

Claims (1)

[Claims] 1. In a propeller ship that is removably driven by a main engine, each shaft end of one of two AC rotating machines, each having a synchronous rotation speed corresponding to the two speeds of the main engine, is connected via a clutch. It is connected to the output side of the main engine, and a prime mover is connected to each of the other shaft ends of the two AC rotating machines via clutches, and each terminal of the AC rotating machines is connected to the inboard power source via a changeover switch. A propeller ship propulsion device characterized by being switchably connected to a circuit with a frequency converter/breaker connected to a bus bar and a circuit with a circuit breaker.