JPH06144354A - Spray type outboard drain device - Google Patents

Abstract

PURPOSE:To prevent generation particularly of underwater noise, relating to a drain device to the outboard. CONSTITUTION:An inboard drain pipe 5 is connected to a drain port 3 formed in a ship body shell plate 14 in the upward of a water level, to provide a gas jetting nozzle 9 opened into the drain pipe 5 in the vicinity of the drain port 3. In this way, a drain from the drain port 3 is discharged in a fog state, to reduce a noise generated in the case of leading to the surface of the sea, and also a radiation noise into the water can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray-type outboard port drainage device capable of reducing noise generated due to drainage from an outboard port of a ship.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 3, a hull 1 is provided with a drain port 3 above a waterline 2 for draining water from the inside of the ship to the outside of the port. As shown in FIG. 2, the drainage port 3 of the hull 1 is formed on the hull outer plate 4, and the inboard drainage pipe 5 is only connected to the drainage port 3 and is discharged into the air from the drainage port 3. Water is discharged as if it were falling to the surface of the sea.

[0003]

By the way, as shown in FIG. 2, when the drainage from the drainage port 3 is discharged into the air and then dropped onto the sea surface, the drainage falls on the sea surface. At that time, noise is generated, and the following problems occur. (1) In the case of a ship equipped with high-performance underwater acoustic equipment such as a marine acoustic research ship, the onboard underwater acoustic equipment is affected by the noise generation shown above. (2) In the case of a ship where it is necessary to reduce the underwater radiation noise as much as possible, the conventional offshore port drainage device causes a problem because the drainage becomes a noise source. The present invention is intended to solve these problems, by spraying from the drainage port to the outside of the port to perform drainage, it is possible to prevent the generation of noise, spray type port drainage The purpose is to provide a device.

[0004]

In order to achieve the above-mentioned object, the spray-type outboard port drainage device of the present invention is connected to a drainage port formed in a hull skin plate above the water surface and the drainage port. A drainage pipe disposed inside the ship, and a gas ejection nozzle opened in the drainage pipe near the drainage port in order to discharge the drainage from the drainage port in the form of spray. Is characterized by.

[0005]

In the above-mentioned spray type outboard drainage device of the present invention, the water discharged to the outboard reaches the sea surface in the state of almost fog, so that the sound generated on the sea surface is reduced as compared with the case where the water directly drops to the sea surface. As a result, radiation noise into the water is also reduced.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A spray type outboard drainage device as an embodiment of the present invention will be described below with reference to the drawings. FIG.
Is formed, and the drainage pipe 5 in the ship is connected to the drainage port 3. A gas ejection nozzle 9 that opens into the drainage pipe 5 is provided in the bent portion of the drainage pipe 5 near the drainage port 3, and the ejection direction of the nozzle 9 is directed to the drainage port 3. Further, a gas supply line 11 for high pressure air or high pressure steam is connected to the nozzle 9, and a control valve 10 is interposed in the line 11. The wastewater is temporarily stored in the small tank 6, and as the water level in the small tank 6 rises gradually, the float sensor 7 mounted in the small tank 6 also rises. Immediately before the drainage flows into the line connected to the drainage pipe 5, the limit switch 8 is actuated and a nozzle activation signal is sent to the control valve 10.

In this way, the nozzle activation signal is transmitted to the control valve.
When sent to 10, the control valve 10 automatically opens and high pressure air or high pressure steam is supplied through the gas supply line 11. When it is not necessary to start the nozzle 9, the limit switch 8 is turned off in advance so that the control valve 10 does not operate. When high-pressure gas is used, it is supplied by any of the following means. Use the chore air line from the compressor. In the case of a ship equipped with a gas turbine, a part of the extracted gas from the gas turbine body is used. When using high-pressure steam, use high-pressure steam from the boiler.

The waste water flowing out from the small tank 6 is the nozzle 9
When it comes to the front of the, the nozzle 9 has already supplied the gas as high-pressure air or high-pressure steam so that the drainage is blown off by the same gas and is discharged in the form of mist outside the port. Like The shape of the drainage pipe 5 at the nozzle 9 may be inclined upward in consideration of flying the injected drainage as far as possible from the hull, and a shape that facilitates the equipment of the nozzle 9 is preferable. . As described above, in this embodiment, the drainage to the outside of the port becomes fog and reaches the sea surface. Therefore, the sound generated at the sea surface due to the drainage can be reduced, and the radiation noise into the water can also be reduced.

[0009]

As described above in detail, according to the spray type port outside drainage device of the present invention, since the drainage to the outside of the port is performed in the state of fog, the underwater radiation noise due to the drainage is reduced to the conventional level. It is possible to significantly reduce it.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main portion of a hull schematically showing a spray type outboard port drainage device as an embodiment of the present invention.

FIG. 2 is a transverse cross-sectional view of a main portion of a hull showing a conventional off-board drainage device.

FIG. 3 is an explanatory view showing a mode of drainage from the inside of the ship to the outboard side of a normal ship.

[Explanation of symbols]

 1 Hull 2 Draft Line 3 Drain Port 4 Hull Outer Plate 5 Drain Pipe 6 Drainage Small Tank 7 Float Sensor 8 Limit Switch 9 Gas Jet Nozzle 10 Control Valve 11 High Pressure Gas Supply Line

Claims (1)

[Claims] 1. A drainage port formed on a hull skin plate above the water surface and a drainage pipe disposed inside the ship so as to be connected to the drainage port, wherein the drainage from the drainage port is sprayed. A spray-type outboard port drainage device, characterized in that a gas ejection nozzle opened in the drainage pipe is provided in the vicinity of the drainage port so as to be discharged.