JP3949017B2 - Reduced water tank equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reduced water tank device that suppresses rolling of a ship.
[0002]
[Prior art]
Conventionally, as a device for reducing the rolling of a ship, a pair of left and right wing tanks in which a vibration reducing fluid is introduced, a connecting water channel that communicates the lower part of the pair of wing tanks, and the upper part of the pair of wing tanks are communicated An anti-vibration tank having an air duct is known.
[0003]
In the early stages of the development of the anti-vibration tank, an air duct was provided at the top of each wing tank to open the air in the wing tank directly to the atmosphere in order to make the sway mitigation fluid inside the pair of wing tanks movable. There was a type that opened the air duct valve attached to the air duct to move the sway mitigation fluid inside the wing tank in a movable state, but two large-diameter air duct valves were installed. There is a problem in terms of cost and arrangement that must be done, and at present, a communication type air duct type in which the upper parts of a pair of wing tanks communicate with each other is mainly used.
[0004]
After that, by installing dampers in the connecting water channel that communicates the lower part of the pair of wing tanks, a variable-period type water-reducing water tank that can change the natural period of the water-reducing water tank and correspond to a wide rolling period was developed. It was. An example of such a variable period type anti-vibration water tank is disclosed in Japanese Patent No. 3048865 (hereinafter referred to as a conventional example).
[0005]
In these anti-vibration water tanks, fresh water, seawater, heavy fuel oil A and the like are generally used as the vibration reducing fluid. Usually, an air vent pipe is installed at the upper part of the wing tank, etc., and the air vent pipe is opened to allow circulation with the atmosphere. It makes it easy to discharge the vibration relaxation fluid from the inside.
[0006]
In the above-described conventional example, in order to switch between the operation and non-operation of the anti-vibration water tank, an air duct opening / closing valve is provided in the air duct that communicates the upper portions of the pair of wing tanks, and the air duct opening / closing valve is closed. By doing so, the movement of the vibration reducing fluid is stopped and the vibration reducing water tank is deactivated.
[0007]
Therefore, in the conventional example, it is necessary to be in an airtight state in which the air in the anti-vibration water tank is blocked from the atmosphere, and the pipes attached to the anti-vibration water tank such as an air vent pipe have a closing device such as a valve. It is installed and has a structure that can maintain airtightness.
[0008]
[Problems to be solved by the invention]
As described above, in the conventional anti-vibration water tank, the air in the anti-vibration water tank is used in an airtight state where the air and the atmosphere are blocked.
[0009]
However, if a liquid that is easy to vaporize, such as A heavy oil, is used as the vibration mitigating fluid, A heavy oil, etc. will move violently through the connecting water channel that connects the lower part of the wing tank during operation of the anti-vibration tank. It will be stirred and it will be in the state which is easy to generate | occur | produce a droplet and vaporization gas, and vaporization gas will be filled in the wing tank. On the other hand, in the conventional anti-vibration water tank, since the air in the anti-vibration water tank is used in an airtight state where the air is blocked, the vaporized gas pressure in the airtight wing tank rises, In the worst case, there is a concern about the occurrence of damage such as deformation of the shaking tank due to pressure rise.
[0010]
Also, when using A heavy oil as a vibration mitigating fluid, fuel A heavy oil until it reaches the working water level of the vibration mitigating fluid in the vibration reducing water tank when it is sailing, and the A heavy oil is fully loaded in the water tank. However, when the heavy oil A is discharged from the vibration-reducing water tank by the fuel transfer pump, if it is discharged in an airtight state due to an erroneous operation, the pressure inside the wing tank is abnormally reduced. If left unattended, there is a risk of causing a damage accident such as deformation of the shaking tank due to the pressure difference from the atmospheric pressure. Conversely, when fuel oil A is injected with heavy fuel oil into the agitated water tank, if the fuel is pumped in an airtight state due to an erroneous operation, the pressure inside the tank will rise abnormally, and if left unattended, the pressure difference from atmospheric pressure There is a risk of causing damage accidents such as deformation of the shaking tank.
[0011]
If the air duct of the method that opens the air in the wing tank directly to the atmosphere, which was used at the beginning of the development of the anti-vibration water tank, is adopted, Although it is possible to prevent the vaporized gas pressure from rising, there is a problem in that the splash of A heavy oil or the like scatters into the atmosphere through a large-diameter air duct, and the amount of A heavy oil or the like in the reduced water tank decreases. There is also a problem that the vicinity of the open part of the air duct is contaminated with splashes of A heavy oil or the like. Therefore, it is inappropriate to employ an air duct that directly opens the wing tank to the atmosphere.
[0012]
The present invention has been made to solve the above-described problem, and is a liquid that is easy to vaporize and is a fuel that is easily vaporized, such as A heavy oil, as an oscillation mitigating fluid, in an anti-vibration water tank apparatus that suppresses rolling of a ship. An object of the present invention is to provide an anti-vibration water tank apparatus that can prevent the occurrence of damage such as deformation of the anti-vibration water tank even when a liquid used as a liquid crystal is used.
[0013]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has the following features [1] and [2] .
[0014]
[1] A pair of left and right wing tanks installed in a ship and filled with liquid, a connecting water channel communicating the lower portions of the pair of wing tanks, an air duct communicating the upper portions of the pair of wing tanks, The air duct is provided in the air duct and has an air duct opening / closing valve that switches between moving and non-moving of the liquid by opening and closing thereof, and the air based on the roll angle measurement data output from the roll angle detecting means. An anti-vibration water tank apparatus comprising an anti-vibration water tank control device that controls opening and closing of a duct open / close valve, the anti-vibration water tank is provided with an air vent pipe and an air vent pipe on-off valve that switches an open / close state of the air vent pipe, When the air duct on / off valve is open, the air vent pipe on / off valve is opened to allow the gas in the anti-vibration water tank to flow between the atmosphere and the air duct on / off valve. Bed is swinging motion reducing aquarium apparatus being characterized in that so as to cut off the flow of the gas and air in the swinging motion reducing the water tank by closing the vent line off valve when the closed state.
[0015]
[2] Automatic breathing that operates when the pressure of the gas in the shaking tank is out of a predetermined pressure range and keeps the pressure of the gas in the shaking tank within the predetermined pressure range. A reduced water tank apparatus according to the above [1], wherein a valve is provided.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
A first embodiment of a reduced water tank apparatus according to the present invention is shown in FIG. FIG. 1A is an overall configuration diagram, and FIG. 1B is a perspective view of a vibration-reducing water tank.
[0017]
The anti-vibration water tank apparatus according to the first embodiment of the present invention includes an anti-vibration water tank 21 and an anti-vibration water tank control apparatus 31.
[0018]
The anti-vibration water tanks 21 are provided on the port side and starboard side of the hull, respectively, wing tanks 1a and 1b charged with the vibration reducing fluid W, a connecting water channel 2 that connects the lower parts of the wing tank 1a and the wing tank 1b, and a wing tank 1a and the upper part of the wing tank 1b are communicated with each other, and the air duct 5 is provided in the air duct 5, and the air duct 5 is opened and closed to restrict the air flow, thereby switching between the movement and non-movability of the vibration reducing fluid W. And an air duct opening / closing valve 6 for switching between the operation and non-operation of the anti-vibration water tank. Note that the wing tanks are not a pair, and there may be two or more wing tanks called a double wing system, etc., and there may be two or three or more connected water channels 2 communicating between the wing tanks. good. In addition, a damper that restrains the movement of the vibration reducing fluid W in the connecting water channel 2 and provided with a variable period type vibration reducing water tank capable of giving a difference in the moving period of the vibration reducing fluid W in the vibration reducing water tank 21 may be used. Good.
[0019]
An air duct opening / closing valve driving device 7 is attached to the air duct opening / closing valve 6 for shutting off the air flow in the air duct 5 connecting the wing tank 1a and the wing tank 1b. The air duct opening / closing valve 6 is opened and closed by the device 7. That is, when the anti-vibration water tank 21 is in an operating state, the air duct opening / closing valve 6 is in an open state, the vibration reducing fluid W in the anti-vibration water tank 21 is in a movable state, and when the anti-vibration water tank 21 is in an inactive state. Then, the air duct opening / closing valve 6 is closed, and the vibration reducing fluid W in the vibration reducing water tank 21 is set in a non-movable state.
[0020]
And the air vent pipe 13 is installed in the upper part of the wing tanks 1a and 1b. The air vent pipe 13 is provided with an air vent pipe on / off valve 14 for opening and closing the air vent pipe 13. The air vent pipe on / off valve drive device 15 attached to the air vent pipe on / off valve 14 causes the air vent pipe on / off valve 14 to be opened and closed. It is designed to be opened and closed. That is, when the air vent pipe opening / closing valve 14 is opened, the gas in the wing tanks 1a, 1b is released to the atmosphere, and when the air vent pipe opening / closing valve 14 is closed, the gas in the wing tanks 1a, 1b is shut off from the atmosphere. Is supposed to be airtight. Note that the cross-sectional area of the air vent pipe 13 is about 2% of the cross-sectional area of the air duct 5.
On the other hand, the shaking tank control device 31 stores the central control device 10, the opening / closing control device 9 for sending control signals to the air duct opening / closing valve driving device 7 and the air vent pipe opening / closing valve driving device 15, and the measurement values, analysis data, and the like. Storage device 11, display device 12 for displaying operation screens and analysis data, and roll angle detection device 8. The central control device 10 includes statistical processing means 10 a that calculates a rolling cycle or the like from time-series rolling angle measurement data output from the rolling angle detection device 8.
[0021]
In the reduced water tank apparatus configured as described above, the statistical processing means 10a performs analysis based on the roll angle measurement data output from the roll angle detection device 8, and the central control is performed based on the analysis value. The device 10 instructs the opening / closing control device 9, and a control signal is sent from the opening / closing control device 9 to the air duct opening / closing valve driving device 7 and the air vent tube opening / closing valve driving device 15, and the air duct opening / closing valve 6 and the air vent tube opening / closing valve. 14 is opened and closed. At that time, the air duct opening / closing valve 6 and the air vent pipe opening / closing valve 14 are controlled to be in the same open / closed state. That is, when the air duct opening / closing valve 6 is open, the air vent pipe opening / closing valve 14 is also open, and when the air duct opening / closing valve 6 is closed, the air vent pipe opening / closing valve 14 is also closed. To control.
[0022]
Thus, in this embodiment, even when A heavy oil is used as the vibration reducing fluid W, the air duct opening / closing valve 6 and the air vent are removed when the reduced water tank 21 in which vaporized gas is likely to be generated from the A heavy oil is in operation. Since the pipe open / close valve 14 is opened and the gas in the wing tanks 1a and 1b is released to the atmosphere, the pressure in the wing tanks 1a and 1b can be prevented from rising due to the vaporized gas. At this time, even if the anti-vibration water tank 21 is not airtight, there is no problem in the operation of the anti-vibration water tank 21. Therefore, there is no problem even if the air vent pipe opening / closing valve 14 is opened during the operation of the anti-vibration water tank. Further, since the air containing the vaporized gas moves between the wing tanks 1a and 1b through the air duct 5 having a large diameter as compared with the air vent pipe 13, the air vent pipe is compared with the system in which the air duct is directly opened to the atmosphere. The amount of diffusion of the droplets from 13 decreases so as not to cause a problem.
[0023]
On the other hand, when the vibration reducing water tank 21 is in an inoperative state, the air duct opening / closing valve 6 and the air vent pipe opening / closing valve 14 are closed, the vibration reducing water tank 21 is airtight, and the air duct 5 is closed. The flow of air between the wing tanks 1a and 1b is blocked, and the movement relaxing fluid W cannot move. Accordingly, when the anti-vibration tank 21 is not in operation, the A-heavy oil of the vibration reducing fluid does not move in the anti-vibration tank 21, so the possibility of generation of vaporized gas becomes extremely low, and the pressure in the wing tanks 1a and 1b increases. The risk of doing so is also very low.
[0024]
Therefore, in the reduced water tank apparatus according to this embodiment, even when a liquid that is easily vaporized such as A heavy oil is used as the vibration reducing fluid, the occurrence of damage such as deformation of the reduced water tank 21 is prevented. be able to.
[0025]
In addition, when the anti-vibration water tank 21 is not in operation, the air vent pipe opening / closing valve 14 is controlled to be opened every predetermined time (for example, every 10 minutes) for a predetermined time (for example, 1-2 seconds). Even during non-operation, it is possible to eliminate the risk of the vaporized gas pressure rising in the anti-vibration water tank 21 and to make the anti-vibration water tank safer against the generation of vaporized gas.
[0026]
In this embodiment, the air vent pipe 13, the air vent pipe on / off valve 14, and the air vent pipe on / off valve driving device 15 are installed above the wing tanks 1a and 1b. Only the air vent pipe 13 may be installed, and the air vent pipe on / off valve 14 and the air vent pipe on / off valve driving device 15 may be omitted. Also, the installation location may be installed on the side, front and rear surfaces of the wing tank, the air duct 5 or the like. When the air duct opening / closing valve 6 is opened, the air vent pipe opening valve 14 is opened. 1 b may be installed at a position where the gas in 1b can be opened to the atmosphere.
[0027]
(Second Embodiment)
The second embodiment of the swinging motion reducing aquarium apparatus according to the present invention shown in FIG. 2 (a) is an overall configuration diagram, FIG. 2 (b) is a perspective view of a swinging motion reducing aquarium.
[0028]
The anti-vibration water tank apparatus according to the second embodiment of the present invention includes an anti-vibration water tank 24 and an anti-vibration water tank control apparatus 34.
[0029]
And the anti-vibration water tank 24 installs the air vent pipe 16 in which the automatic breathing valve 17 was attached to the anti-vibration water tank 21 in the said 1st Embodiment. The other configuration is the same as that of the reduced water tank 21 in the first embodiment.
[0030]
Moreover, the anti-vibration water tank control apparatus 34 is the same as the anti-vibration water tank control apparatus 31 in the first embodiment.
[0031]
That is, even when A heavy oil is used as the vibration reducing fluid W, the air duct opening / closing valve 6 and the air vent pipe opening / closing valve 14 are opened when the vibration reducing tank 24 in which vaporized gas is likely to be generated from the A heavy oil is opened. Since the gas in the tanks 1a and 1b is released to the atmosphere, it is possible to prevent the gas pressure in the wing tanks 1a and 1b from rising due to the vaporized gas.
[0032]
On the other hand, when the vibration reducing water tank 24 is in an inoperative state, the air duct opening / closing valve 6 and the air vent pipe opening / closing valve 14 are closed, the vibration reducing water tank 24 is in an airtight state, and the air duct 5 is in a closed state. The flow of air between the wing tanks 1a and 1b is blocked, and the movement relaxing fluid W cannot move. Therefore, when the anti-vibration water tank 24 is not in operation, the heavy oil A of the vibration reducing fluid does not move in the anti-vibration water tank 24, so the possibility of generation of vaporized gas becomes extremely low, and the pressure in the wing tanks 1a and 1b increases. The risk of doing so is also very low.
[0033]
Also, when the A heavy oil is discharged from the anti-vibration water tank 24 by a fuel transfer pump (not shown), when the anti-vibration water tank 24 is in an inoperative state or the anti-vibration water tank control device 34 is in an OFF state, etc. Even if the wing tanks 1a and 1b are discharged in an airtight state and the gas pressure in the wing tanks 1a and 1b drops abnormally, the automatic breathing valve 17 operates and the atmosphere enters the wing tanks 1a and 1b. Since the pressure of the gas in the wing tanks 1a and 1b approaches the atmospheric pressure when the gas flows in, the pressure of the gas in the wing tanks 1a and 1b drops abnormally and the occurrence of damage such as deformation of the anti-vibration water tank 24 occurs. Can be prevented.
[0034]
On the contrary, when the heavy oil A is injected into the vibration reducing tank 24 by the fuel transfer pump, the wing tank 1a, Even if 1b is injected in an airtight state and the pressure of air in the wing tanks 1a and 1b rises abnormally, the automatic breathing valve 17 operates and the air in the wing tanks 1a and 1b is released to the atmosphere. Since the pressure of the air in the wing tanks 1a and 1b is reduced, it is possible to prevent the occurrence of damage such as an abnormal increase in the pressure of the air in the wing tanks 1a and 1b and the deformation of the shaking tank 24. it can.
[0035]
Therefore, in the reduced water tank apparatus according to this embodiment, the reduced water tank 24 is used even when a liquid that is easily vaporized and used as a fuel, such as A heavy oil, is used as the vibration reducing fluid. It is possible to prevent the occurrence of damage such as deformation.
[0036]
【The invention's effect】
In the present invention, even when heavy oil A is used as the vibration mitigating fluid, the pressure of the gas in the anti-vibration water tank can be adjusted appropriately, thus preventing pressure damage of the anti-vibration water tank accompanying the increase in vaporized gas pressure. It becomes possible to do.
Furthermore, it becomes possible to prevent pressure damage of the vibration-reducing water tank due to an erroneous operation at the time of injection / discharge of heavy fuel oil A.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a first embodiment of a reduced water tank apparatus according to the present invention.
FIG. 2 is an explanatory diagram of a second embodiment of a reduced water tank apparatus according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1a, 1b Wing tank 2 Connection water channel 5 Air duct 6 Air duct opening / closing valve 7 Air duct opening / closing valve drive device 8 Rolling angle detection device 9 Opening / closing control device 10 Central control device 10a Statistical processing means 11 Storage device 12 Display device 13 Air vent pipe 14 Air vent pipe on / off valve 15 Air vent pipe on / off valve drive device 16 Air vent pipe 17 Automatic breathing valve
21, 24 Agitated water tank
31, 34 Reduced water tank control device

Claims (2)

  A pair of left and right wing tanks installed in a ship and filled with liquid, a connecting water channel communicating the lower portions of the pair of wing tanks, an air duct communicating the upper portions of the pair of wing tanks, and the air duct And an air duct open / close valve having an air duct open / close valve that switches between moving and non-movable of the liquid by opening and closing the air duct, and the air duct open / close valve based on roll angle measurement data output from the roll angle detecting means An anti-vibration water tank apparatus comprising an anti-vibration water tank control device for controlling the opening and closing of the air duct, wherein the anti-vibration water tank is provided with an air vent pipe and an air vent pipe on-off valve for switching the open / close state of the air vent pipe, When the valve is open, the air vent pipe opening / closing valve is opened to allow the gas in the anti-vibration water tank to flow between the atmosphere and the air duct opening / closing valve. Swinging motion reducing aquarium apparatus being characterized in that so as to cut off the flow of the gas and air in the swinging motion reducing the water tank by closing the vent line off valve when the chain state.   An automatic breathing valve that operates when the gas pressure in the anti-vibration water tank is out of a predetermined pressure range and holds the gas pressure in the anti-vibration water tank within the predetermined pressure range is provided in the anti-vibration water tank. The anti-quake water tank apparatus according to claim 1.

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