JP4782216B2 - Ship vibration reduction device - Google Patents

Description

  The present invention relates to a ship vibration reduction device.

  Patent document 1 is disclosing the anti-vibration apparatus for reducing the shaking of a ship etc. The vibration reduction device includes a motor, a flywheel driven by the motor, a gimbal with a built-in flywheel, a support portion that supports the gimbal so as to be swingable, and a friction damper that brakes the swing of the gimbal. A motor power supply for supplying electric power to the motor and a control unit. The control unit prevents power supply to the motor from being interrupted when the gimbal swings more than a predetermined angle, thereby preventing the vibration reduction device from being damaged due to the gimbal swing exceeding the specification limit.

Japanese Patent No. 3556857

  An object of the present invention is to prevent damage to a ship's vibration reduction device.

  The means for solving the problem will be described below using the numbers used in the (DETAILED DESCRIPTION). These numbers are added to clarify the correspondence between the description of (Claims) and (Mode for Carrying Out the Invention). However, these numbers should not be used to interpret the technical scope of the invention described in (Claims).

  A ship vibration reduction device according to the present invention includes a flywheel (11), a gimbal (12) that rotatably supports the flywheel, a motor (13) that drives the flywheel, and a rocker that can swing the gimbal. The gimbal support portion (14) supported by the motor, the first damper (15A) for braking the swing of the gimbal, the motor driver (20) for supplying driving power to the motor, and the temperature of the first damper are predetermined. And a safety device (40, 50) that cuts off the supply of the driving power to the motor driver when the temperature exceeds the temperature.

  When the temperature of the first damper exceeds a predetermined temperature, the supply of driving power to the motor is automatically cut off, so that the vibration reduction device is prevented from being damaged.

  It is preferable that the safety device includes a first bimetal switch (41A) provided in the first damper. The motor driver includes an input terminal (21) connected to the generator (30), an output terminal (22) connected to the power cable (13a) of the motor, a first terminal (23), and the first It is preferable to include a second terminal (24) connected to the first terminal via a one bimetal switch, and a relay (25) provided between the input terminal and the output terminal. When the relay is turned off between the first terminal and the second terminal, the relay is turned off between the input terminal and the output terminal.

  Since the supply of driving power to the motor is automatically cut off using the bimetal switch and the relay, the manufacturing cost of the safety device is suppressed.

  It is preferable that the ship vibration reduction device further includes a second damper (15B) for braking the rocking of the gimbal. It is preferable that the safety device includes a second bimetal switch (41B) provided in the second damper. The first bimetal switch and the second bimetal switch are connected in series. The second terminal is connected to the first terminal through the first bimetal switch and the second bimetal switch.

  Since the first bimetal switch and the second bimetal switch are connected in series, the supply of drive power to the motor is interrupted when the temperature of at least one of the first damper and the second damper exceeds a predetermined temperature. .

  A ship vibration reduction device according to the present invention includes a flywheel (11), a gimbal (12) that rotatably supports the flywheel, a motor (13) that drives the flywheel, and a rocker that can swing the gimbal. A drive power is supplied to the motor, a gimbal support portion (14) for supporting the gimbal, a first damper (15A) for braking the swing of the gimbal, a second damper (15B) for braking the swing of the gimbal, and the motor. And a safety device (40, 50) that causes the motor driver to cut off the supply of the driving power when the temperature of at least one of the first damper and the second damper exceeds a predetermined temperature. It comprises.

  When the temperature of at least one of the first damper and the second damper exceeds a predetermined temperature, the supply of the driving power to the motor is automatically shut off, so that the vibration reduction device is prevented from being damaged.

  According to the present invention, breakage of the ship's vibration reduction device is prevented.

FIG. 1 is a schematic diagram of a vibration reducing device according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the vibration reduction device main body. FIG. 3 is a schematic diagram of a vibration reducing device according to the second embodiment of the present invention.

  With reference to an accompanying drawing, the form for carrying out the ship rocking device by the present invention is explained below.

(First embodiment)
As shown in FIG. 1, the ship vibration reduction device according to the first embodiment of the present invention includes a vibration reduction device main body 10, a motor driver 20, a generator 30, and a safety device 40. The vibration reduction device main body 10 includes a motor 13, a damper 15A, and a damper 15B. The generator 30 and the motor 13 are a three-phase generator and a three-phase motor, respectively. The motor driver 20 includes an input terminal 21, an output terminal 22, a CM terminal 23, an X1 terminal 24, and a relay 25. The input terminal 21 includes an R terminal, an S terminal, and a T terminal. The output terminal 22 includes a U terminal, a V terminal, and a W terminal. The relay 25 is provided between the input terminal 21 and the output terminal 22. The relay 25 opens and closes the connection between the R terminal and the U terminal, the connection between the S terminal and the V terminal, and the connection between the T terminal and the W terminal. The input terminal 21 is connected to the generator 30 via the breaker switch 31. The output terminal 22 is connected to the power cable 13 a of the motor 13. The safety device 40 includes a bimetal switch 41A provided in the damper 15A and a bimetal switch 41B provided in the damper 15B. The bimetal switches 41A and 41B monitor the temperatures of the dampers 15A and 15B, respectively. The bimetal switch 41A opens when the temperature of the damper 15A exceeds a predetermined temperature. The bimetal switch 41B opens when the temperature of the damper 15B exceeds a predetermined temperature. The CM terminal 23 is connected to the X1 terminal 24 via the bimetal switches 41A and 41B. Since the bimetal switches 41A and 41B are connected in series, when both of the bimetal switches 41A and 41B are closed, the CM terminal 23 and the X1 terminal 24 are in an on state (conductive state), and the bimetal switch 41A and When at least one of the terminals 41B opens, the CM terminal 23 and the X1 terminal 24 are turned off (non-conducting state). The relay 25 turns on between the input terminal 21 and the output terminal 22 when the connection between the CM terminal 23 and the X1 terminal 24 is on (closes the connection between the input terminal 21 and the output terminal 22). When the space between the X1 terminals 24 is turned off, the space between the input terminal 21 and the output terminal 22 is turned off (connection between the input terminal 21 and the output terminal 22 is opened). The motor driver 20 supplies driving power to the motor 13 when the relay 25 is in the ON state between the input terminal 21 and the output terminal 22, and the relay 25 is in the OFF state between the input terminal 21 and the output terminal 22. Then, the supply of drive power is cut off.

  As shown in FIG. 2, the vibration reduction device main body 10 includes a flywheel 11, a gimbal 12, a motor 13, a gimbal support portion 14, and dampers 15A and 15B. The gimbal 12 supports the flywheel 11 so that the flywheel 11 can rotate about the rotation axis S1. The motor 13 drives the flywheel 11. The gimbal support portion 14 supports the gimbal 12 so that the gimbal 12 can swing around the swing axis S2. Each of the dampers 15A and 15B brakes the swing of the gimbal 12 by the flow resistance of the hydraulic oil. The dampers 15A and 15B are, for example, rotary dampers. The swing axis S2 is orthogonal to the rotation axis S1. The gimbal support portion 14 is fixed to the hull. The bimetal switches 41A and 41B are attached to the outside of the dampers 15A and 15B, respectively.

  Taking the case where the left and right axis of the hull is parallel to the swing axis S2 as an example, the principle that the vibration reduction device according to the present embodiment reduces the vibration of the ship will be described. The flywheel 11 is driven by a motor 13 and rotates at high speed so as to have an angular momentum H. When the hull rolls at an angular velocity Ω in response to a transverse wave, a gyro torque T1 represented by the outer product of the angular momentum H and the angular velocity Ω acts on the gimbal 12, and the gimbal 12 swings about the swing axis S2. At this time, since the flywheel 11 tries to maintain the angular momentum H, the counter torque T <b> 2 acts on the hull via the gimbal support portion 14. When the angular velocity of the swing of the gimbal 12 is ω, the counter torque T2 is expressed by the outer product of the angular momentum H and the angular velocity ω. Since the counter torque T2 acts in the direction opposite to the hull roll direction, the hull roll direction swing is reduced.

  For example, when the anti-vibration device is used in an overload environment, such as when a ship equipped with the anti-vibration device according to the present embodiment navigates in a high wave region, the gimbal 12 oscillates vigorously. There is a possibility that the sealing material which seals the hydraulic oil due to the high temperature of 15B is damaged. When hydraulic oil leaks, the gimbal 12 is not braked, and the vibration reducing device may be damaged.

  Referring to FIG. 1, when damper 15A becomes higher than a predetermined temperature, bimetal switch 41A is opened, and between CM terminal 23 and X1 terminal 24 is turned off. Then, since the relay 25 turns off between the input terminal 21 and the output terminal 22, the motor driver 20 automatically cuts off the supply of drive power. Even when the damper 15B becomes higher than a predetermined temperature, the motor driver 20 automatically cuts off the supply of drive power as in the case of the damper 15A. That is, the safety device 40 causes the motor driver 20 to cut off the supply of drive power when the temperature of at least one of the dampers 15A and 15B exceeds a predetermined temperature. As a result, the oscillating device main body 10 is safely stopped, and the dampers 15A and 15B are prevented from being damaged.

  Also, when an abnormality occurs in the damper 15A or 15B, the damper 15A or 15B becomes high temperature. According to the present embodiment, it is possible to prevent the vibration reducing device from continuing to operate in a state where an abnormality has occurred in the damper 15A or 15B. As a result, damage to the damper 15A or 15B is prevented, and damage to the vibration reduction device main body 10 is prevented.

  Furthermore, if the atmospheric temperature of the vibration reduction device main body 10 is high, the dampers 15A and 15B cannot release heat to the surroundings, so that the braking force of the dampers 15A and 15B decreases. If the vibration reduction device continues to operate in a state where the braking force of the dampers 15A and 15B is reduced, the vibration reduction device main body 10 may be damaged. According to the present embodiment, since the vibration reducing device is stopped when the ambient temperature is high, damage to the vibration reducing device main body 10 is prevented.

  Since the bimetal switches 41A and 41B are disposed outside the dampers 15A and 15B, respectively, the assembly of the vibration reducing device is easy. The bimetal switches 41A and 41B may be disposed in the dampers 15A and 15B, respectively.

(Second Embodiment)
With reference to FIG. 3, a description will be given of a ship vibration reduction device according to a second embodiment of the present invention. In the vibration reduction device according to the present embodiment, the safety device 40 of the vibration reduction device according to the first embodiment is replaced with a safety device 50. The safety device 50 includes temperature sensors 51A and 51B such as thermocouples and thermistors, and a determination unit 52. The temperature sensors 51A and 51B are provided in the dampers 15A and 15B, respectively. The temperature sensor 51A monitors the temperature of the damper 15A and outputs a signal indicating the temperature of the damper 15A to the determination unit 52. The temperature sensor 51B monitors the temperature of the damper 15B and outputs a signal indicating the temperature of the damper 15B to the determination unit 52. The determination unit 52 is connected to the CM terminal 23 and the X1 terminal 24, respectively. The determination unit 52 determines whether the temperature indicated by the signals from the temperature sensors 51A and 15B is higher than a predetermined temperature. When both the signal from the temperature sensor 51 </ b> A and the signal from the temperature sensor 51 </ b> B indicate a temperature lower than a predetermined temperature, the determination unit 52 turns on between the CM terminal 23 and the X1 terminal 24. When the temperature indicated by at least one of the signal from the temperature sensor 51 </ b> A and the signal from the temperature sensor 51 </ b> B exceeds a predetermined temperature, the determination unit 52 turns off between the CM terminal 23 and the X1 terminal 24. Therefore, the safety device 50 cuts off the supply of drive power to the motor 13 when the temperature of at least one of the dampers 15A and 15B exceeds a predetermined temperature.

  When the temperature sensors 51A and 51B are disposed outside the dampers 15A and 15B, respectively, it is easy to assemble the vibration reduction device. The temperature sensors 51A and 51B may be disposed in the dampers 15A and 15B, respectively.

  In the above embodiments, the generator 30 and the motor 13 may be a single-phase generator and a single-phase motor, respectively. The dampers 15A and 15B may be friction dampers, linear dampers, hydraulic pumps, or the like.

DESCRIPTION OF SYMBOLS 10 ... Shaking device main body 11 ... Flywheel 12 ... Gimbal 13 ... Motor 13a ... Power cable 14 ... Gimbal support part 15A, 15B ... Damper 20 ... Motor driver 21 ... Input terminal 22 ... Output terminal 23 ... CM terminal 24 ... X1 terminal 25 ... Relay 30 ... Generator 31 ... Breaker switch 40 ... Safety device 41A, 41B ... Bimetal switch 50 ... Safety device 51A, 51B ... Temperature sensor 52 ... Determination unit S1 ... Rotating shaft S2 ... Swing shaft

Claims (4)

With flywheel,
A gimbal that rotatably supports the flywheel;
A motor for driving the flywheel;
A gimbal support portion for swingably supporting the gimbal;
A first damper for braking the swing of the gimbal;
A motor driver for supplying driving power to the motor;
And a safety device that causes the motor driver to cut off the supply of the driving power when the temperature of the first damper exceeds a predetermined temperature. The safety device includes a first bimetal switch provided in the first damper,
The motor driver is
An input terminal connected to the generator;
An output terminal connected to the power cable of the motor;
A first terminal;
A second terminal connected to the first terminal via the first bimetal switch;
A relay provided between the input terminal and the output terminal;
The ship rocking device according to claim 1, wherein when the relay is turned off between the first terminal and the second terminal, the relay is turned off between the input terminal and the output terminal. A second damper for braking the swing of the gimbal;
The safety device includes a second bimetal switch provided in the second damper,
The first bimetal switch and the second bimetal switch are connected in series,
The ship's vibration reduction device according to claim 2, wherein the second terminal is connected to the first terminal via the first bimetal switch and the second bimetal switch. With flywheel,
A gimbal that rotatably supports the flywheel;
A motor for driving the flywheel;
A gimbal support portion for swingably supporting the gimbal;
A first damper for braking the swing of the gimbal;
A second damper for braking the swing of the gimbal;
A motor driver for supplying driving power to the motor;
A ship vibration reduction device, comprising: a safety device that causes the motor driver to cut off the supply of the driving power when the temperature of at least one of the first damper and the second damper exceeds a predetermined temperature.

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