JPH07237582A - Drainage system for ship - Google Patents

Abstract

PURPOSE:To prevent a reverse flow of water into a ship from a drain port and a reverse flow of water, drawn up from the ship bottom, into a drain pipe by simplifying a drainage structure of bilge water and filtrated water. CONSTITUTION:A device comprises a drain pipe 21 connected to communicate with an air room 9 having an outside air introducing port 6, opened to the ship body upper part, to drain water filtrated into the air room 9 from outside a ship through the outside air introducing port 6 and the first/second bilge pipe 24, 26 for draining water, accumulated in a ship bottom 22, to outside the ship through a drain port, to connect the drain pipe 21 to the first/second bilge pipes 24, 26, and a connecting region to the drain pipe 21 in the first/ second bilge pipes 24, 26 is set to a reverse U-shape. In this way, a connecting part of the drain pipe 21 to the first/second bilge pipes 24, 26 is set to a position higher than the drain port, and an internal diameter of the drain pipe 21 is set to a diameter smaller than internal diameters of the first/second bilge pipes 24, 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ship drainage device equipped in a small jet propulsion boat, etc., and particularly to a structure for draining water accumulated at the bottom of a ship or water that has penetrated into the ship from an outside air inlet. The present invention relates to a drainage device for a ship, which is suitable for such cases.

[0002]

2. Description of the Related Art Conventionally, small jet propulsion boats have been in widespread use in which jet water jets are propelled to the rear of the stern by a jet pump mounted inside the bottom of the stern. Figure 10
Shows an example of a conventional small jet propulsion boat,
The small jet propulsion watercraft includes a hull 50, operating handles 51 and 52 mounted on a central portion of the hull 50, a driver seat 53 mounted on a rear portion of the hull 50, and a hull 50.
And an outside air introduction port 54 for introducing outside air for inhaling the engine from the outside of the ship to the inside of the engine room.

Further, an air room 55 communicating with the outside air introduction port 54 is provided inside the front portion of the hull 50, and the outside air introduced from outside the ship through the outside air introduction port 54 is the air room. The air is supplied to the inside of the engine room through an air duct (not shown) connected to 55. Further, when the outside air is introduced from the outside of the ship, water may also enter through the outside air introduction port 54 at the same time. Therefore, the water that has entered through the outside air introduction port 54 is separated from the outside air inside the air room 55. The air is discharged to the outside of the ship via a drain pipe connected to the air room 55.

FIG. 11 shows the internal structure of the conventional small jet propulsion boat near the bottom and side surface of the hull. The bottom 57 is an electric motor composed of a bilge pump for pumping up bilge water collected on the bottom 57 and a bilge pump drive motor. Bilge 58 is installed and electric bilge 58
Is driven in conjunction with the start of the engine, and is stopped when the engine is stopped. The bilge water pumped up by the bilge pump of the electric bilge 58 when the engine is started passes through the bilge pipe 59 to the side surface portion 6 of the hull.
It is designed to be discharged to the outside of the ship from the 0 bilge water discharge port 61. The water that has entered the air room 55 described above is discharged to the outside of the ship from the inflow water discharge port 62 of the side surface 60 of the hull via the drain pipe 56.

[0005]

However, in the above-mentioned conventional small jet propulsion watercraft, the side surface portion 6 of the hull is used.
Since the bilge water discharge port 61 and the infiltrated water discharge port 62 are respectively provided at 0, and the bilge water discharge system and the infiltrated water discharge system are separate systems, there is a problem that the drainage structure becomes complicated. Further, since the electric bilge 58 is driven in conjunction with the engine start and is stopped when the engine is stopped, for example, as shown in FIG. 12, when the engine is stopped, the bilge water drainage of the hull side surface portion 60 is eliminated. When the outlet 61 is below the water line (that is, below the water surface S), there is a problem that the water W flows back into the bilge pipe 59 through the bilge water discharge port 61. Further, as described above, since the electric bilge 58 is driven in conjunction with the start of the engine, the electric bilge 58 continues to be driven while the engine is being driven even when the bilge water on the ship bottom is exhausted. There was a problem that the bilge pump drive motor was heated.

[0006]

It is an object of the present invention to improve the disadvantages of the above-mentioned conventional examples, and in particular, to simplify the drainage structure of water accumulated at the bottom of the ship or water that has entered from the outside air inlet, It is an object of the present invention to provide a drainage device for a ship that achieves prevention of reverse flow of water and backflow of water drawn from the ship bottom to a drain pipe.

[0007]

The present invention according to claim 1 is connected to an outside air introducing chamber having an outside air introducing port opened at an upper portion of a hull, and introduces the outside air from outside the ship through the outside air introducing port. A drain pipe for draining water that has entered the room, and a bilge pipe attached to a ship bottom drainage pump for draining water accumulated on the ship bottom to the outside of the ship through a drain port, the drain port being located below the hull. In a ship drainage device provided in a portion, while connecting the drain pipe and the bilge pipe,
A configuration in which a connection point between the drain pipe and the bilge pipe is set at a position between the outside air introduction port and the drain port, and an inner diameter of the drain pipe is set to a dimension smaller than an inner diameter of the bilge pipe. Is taking. This aims to achieve the above-mentioned object.

According to the second aspect of the present invention, the connection region of the bilge pipe with the drain pipe is set in an inverted U shape, and the connection portion with the drain pipe is provided at the uppermost part of the bilge pipe. The composition is adopted.

[0009]

According to the present invention of claim 1, the bilge pipe for draining the water accumulated on the bottom of the ship to the outside of the boat and the drain pipe for draining the water entering from the outside of the boat to the outside air introducing chamber through the outside air introducing port. Since it has a structure in which the drainage ports of the bilge pipe and the drain pipe are shared, the bilge water and the infiltration water can be discharged to the outside of the ship through the common drainage port. Thereby, the drainage structure of bilge water and infiltration water can be simplified. In addition, the inner diameter of the drain pipe is set to a size smaller than the inner diameter of the bilge pipe, and the connection between the drain pipe and the bilge pipe is set to a position between the outside air introduction port and the drain port. Can be made larger than the fluid resistance in the bilge pipe, resulting in a difference in height between the drain pipe and the connection portion of the bilge pipe and the drainage port. As a result, it is possible to prevent a phenomenon that the water outside the ship flows back into the ship from the drain port, or a phenomenon that the water pumped from the bottom of the ship flows back to the outside air introduction chamber side through the drain pipe. Also, for example, when bilge water does not flow inside the bilge pipe, part of the water that has flowed into the drain pipe from the outside of the ship is drained from the bottom of the ship through the connection between the drain pipe and the bilge pipe and the bilge pipe. As a result, when the ship bottom drainage pump is driven by a motor, for example, the motor is cooled by the water supplied from the drain pipe through the bilge pipe to the ship bottom drainage pump side. It is possible to prevent heating of the motor, and as a result, it is possible to extend the life of the motor.

According to the second aspect of the present invention, the connection area of the bilge pipe with the drain pipe is set in an inverted U shape, and the connection part with the drain pipe is provided at the top of the bilge pipe. Therefore, it is possible to more reliably prevent the phenomenon that the water outside the ship flows back into the ship from the drain port, or the water that is pumped up from the bottom flows back to the outside air introduction chamber side through the drain pipe.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

First, the external appearance of the small jet propulsion watercraft according to the present embodiment will be described with reference to FIGS. 4 and 5. The small jet propulsion watercraft comprises a hull 1 and an operation handle 2, which is provided substantially at the center of the hull 1. 3 and a driver's seat 4 and the like mounted on the rear portion of the hull 1. Further, an outside air introduction port 6 for introducing outside air for inhaling the engine into the ship from the outside of the ship is arranged in the substantially central portion of the hull 1 and in the vicinity of the operation handle mounting portion 5. The position of the outside air introduction port 6 is set to a high position of the hull 1 in order to suppress as much as possible the amount of water that enters the air room described below from outside the ship via the outside air introduction port 6.

Next, the structure of the main part of the small jet propulsion watercraft according to the present embodiment will be described with reference to FIGS. 1 to 3 and 6. Inside the substantially central portion of the hull 1, as shown in FIG. An air room 9 surrounded by the partition wall member 7 and the hull cover 8 is arranged in a state of communicating with the outside air introduction port 6, and the lower side wall surface 7a constituting the partition wall member 7 is
It is configured as an inclined surface having a downward slope toward the rear of the hull. Furthermore, the inside of the air room 9 is divided into two first air room parts 9a and second air room parts 9b via the wall member 10, and these first and second air room parts 9a, 9b are It is in a communication state through the opening 11 of the wall member 10.

A fuel tank 12 is disposed inside the hull 1 and below the air room 9, and the hull 1 is also provided.
In the engine room 13 inside the vehicle and below the driver's seat 4, an engine 16 including an engine body 14 and a carburetor 15, a known water jet propulsion mechanism 17 driven by the engine 16, a muffler 18, etc. And are arranged.

As shown in FIG. 2, an upper end portion including an upper opening end 19a of the air duct 19 is provided inside the second air room portion 9b of the air room 9, and the lower opening of the air duct 19 is provided. The end 19b is arranged toward the inside of the engine room 13. The air duct 19 introduces the outside air introduced into the air room 9 from the outside of the ship through the outside air introduction port 6 into the engine room 13 as engine intake air. As a result, the outside air introduced into the engine room 13 is sucked into the carburetor 15 of the engine 16 via the silencer / flame arrester section 20.

A hole 7c is formed in a vertical wall surface 7b on the rear side of the hull of the partition wall member 7, and the upper end portion of the air duct 19 described above is formed in the partition wall member 7.
The second air room portion 9 of the air room 9 through the hole 7c of the
It is located in b. Further, a hole 7d is formed at a location where the lower wall surface 7a and the vertical wall surface 7b of the partition wall member 7 intersect with each other, and the hole 7d is formed in the air room from outside the ship via the outside air introduction port 6. A drain pipe 21 for draining the water that has entered the tank 9 is connected and connected. The broken line arrow in FIG. 2 indicates the flow of the outside air G, and the solid line arrow indicates the flow of the infiltrated water W.

Further, as shown in FIG. 3, the ship bottom 22 of the ship body 1 is provided with an electric bilge 23 including a bilge pump for pumping up the bilge water accumulated on the ship bottom 22 and a bilge pump drive motor. The first bilge pipe 24 is connected to the bilge pump of the electric bilge 23, and the second bilge pipe 26 and the drain pipe 21 described above are connected to the first bilge pipe 24 via a T-shaped union joint 25. (See FIG. 6). You may use Y type | mold as the union joint 25. The second bilge pipe 26 is connected to a drainage port 28 provided on a side surface (port) 27 of the hull.
Drain pipe 21 in first and second bilge pipes 24, 26
The connection region with and is set in an inverted U shape, and the inner diameter of the drain pipe 21 is set to be smaller than the inner diameters of the first and second bilge pipes 24 and 26.

The electric bilge 23 is driven in conjunction with the start of the engine 16 and is stopped when the engine 16 is stopped. The bilge water on the bottom 22 of the ship, which is pumped up by the bilge pump of the electric bilge 23 when the engine 16 is started, is discharged out of the ship through the first bilge pipe 24 and the second bilge pipe 26. There is. Further, the water that has entered the inside of the air room 9 from the outside of the ship via the outside air introduction port 6 is discharged from the drain port 28 to the outside of the ship via the drain pipe 21 and the second bilge pipe 26, and also the drain pipe 21. And is supplied to the electric bilge 23 side via the first bilge pipe 24.

Next, the operation of this embodiment constructed as described above will be described.

When the outside air is introduced into the first air room portion 9a of the air room 9 from the outside of the vessel through the outside air introduction port 6 of the hull 1 when the small jet propulsion watercraft is in a cruising condition, the first air room portion 9a. The outside air inside is introduced into the second air room 9b through the opening 11 of the wall member 10, and the air duct 1
After being introduced into the air duct through the upper open end 19a of the air duct 9, the air duct 19 is introduced into the engine room 13 from the lower open end 19b. As a result, the outside air introduced into the engine room 13 is sucked into the carburetor 15 of the engine 16 via the silencer / flame arrester section 20.

At this time, when water enters from the outside of the ship to the first air room portion 9a of the air room 9 through the outside air introduction port 6 of the hull 1, the entering water is inclined by the inclination of the partition wall member 7. It flows along the lower side wall surface 7a and flows into the drain pipe 21 which is connected to the hole 7d of the partition wall member 7 in communication therewith. The water that has flown into the drain pipe 21 passes through the second bilge pipe 26 through the union joint 25 and is drained outboard through the drainage port 28 of the side surface portion 27 of the hull. In this case, when there is no water inside the first and second bilge pipes 24 and 26, the drain pipe 2
Part of the water in 1 passes through the first bilge pipe 24 and the electric bilge 2
Run down to side 3. As a result, the bilge pump drive motor of the electric bilge 23 is cooled by the water flowing down to the electric bilge 23 side through the first bilge pipe 24, so that heating of the bilge pump drive motor can be prevented.

At this time, since the engine 16 is being driven when the small jet propulsion boat is running, the electric bilge 23 is also driven in conjunction with the driving of the engine 16. Along with this, the water collected in the bottom 22 of the ship that is pumped up by the bilge pump driven by the bilge pump drive motor of the electric bilge 23 and the water that has flowed down the drain pipe 21 are the first bilge pipe 24 and the second bilge pipe 26. The water is drained from the drain port 28 to the outside of the ship via the. In this case, the water flowing down from the drain pipe 21 to the electric bilge 23 side is also drained at the same time.

Further, when the small jet propulsion boat is sailing, the electric bilge 23 is still in operation and the inner diameter of the drain pipe 21 is the first even if the drainage port 28 of the side surface 27 of the hull is below the waterline. The drain pipe 21 has a size smaller than the inner diameters of the first and second bilge pipes 24 and 26.
Since the connecting portion between the first and second bilge pipes 24 and 26 is set at a position between the drain port 28 and the outside air introduction port 6, the drain pipe 21, the first and second bilge pipes 24 and 26 are formed. There is a difference in height between the connection part of the and the drainage port. As a result, the phenomenon that the water outside the ship flows backward from the drain port 28 into the ship,
It is possible to prevent the water pumped from the bottom of the ship from flowing back to the air room 9 side through the drain pipe 21.

As described above, according to this embodiment, the drain pipe 21 for draining water that has entered the inside of the air room 9 through the outside air introduction port 6 from the outside of the boat and the drain pipe 21 for draining the water accumulated at the bottom of the boat. The first and second bilge pipes 24, 26 are connected to each other, and the structure is such that the water that has entered from the outside air inlet and the water that has accumulated at the bottom of the ship are drained to the outside of the ship from the common drain port 28. The drainage structure of the bilge water and the infiltrated water can be simplified as compared with the case where the drainage port of the water that has infiltrated from the above and the drain port of the water that has accumulated at the bottom of the ship are separately provided on the side surface of the hull.

Further, according to this embodiment, the connection regions of the first and second bilge pipes 24 and 26 with the drain pipe 21 are set in an inverted U shape, and the inner diameter of the drain pipe 21 is set to the first and second inner diameters.
Since the drain pipe 21 and the first and second bilge pipes 24, 26 are set to have a size smaller than the inner diameters of the bilge pipes 24, 26 and the drainage port 28 is set above the drain port 28, the drain pipe 21 fluid resistance inside the first and second
It can be made larger than the fluid resistance inside the bilge pipes 24, 26, and at the same time, the drain pipe 21, first and second
There is a difference in height between the connection portion of the bilge pipes 24 and 26 and the drain port, and as a result, water outside the ship is drained from the drain port 28.
It is possible to prevent the phenomenon that the water flows back from the inside to the inside of the ship, and the phenomenon that the water pumped from the bottom of the ship flows back to the air room 9 side through the drain pipe 21.

Further, according to this embodiment, when the bilge water does not flow inside the first and second bilge pipes 24 and 26, a part of the water flowing into the drain pipe 21 from the outside of the ship is removed. , It becomes possible to supply to the electric bilge 23 side via the drain pipe 21 and the first bilge pipe 24. As a result, the bilge pump drive motor of the electric bilge 23 can be supplied to the drain pipe 2
It becomes possible to cool with water that has flowed down from No. 1 through the first bilge pipe 24. As a result, it is possible to prevent the bilge pump drive motor from being heated and it is possible to extend the life of the motor.

Next, a modification of the connecting portion between the bilge pipe and the drain pipe in this embodiment will be described with reference to FIGS. 7 to 9.

FIG. 7 shows the construction of the connecting portion of the bilge pipe and the drain pipe in the first modified example.
A drain pipe 31 is connected to the middle portion of 0, and a lower end portion 31 a of the drain pipe 31 is arranged inside the bilge pipe 30 in a bent state. Further, the open end 31b of the lower end portion 31a of the drain pipe 31 is arranged in a state of being directed in the downstream direction (drain port direction) inside the bilge pipe 30. The arrows in the figure show the flow of bilge water pumped from the bottom of the ship and the water flowing down through the drain pipe 31.

According to the first modification, since the open end 31b of the lower end portion 31a of the drain pipe 31 is arranged so as to face the downstream direction inside the bilge pipe 30, the drain pipe connection inside the bilge pipe 30. As a result of the negative pressure generated in the part, the water that enters the air room 9 from the outside through the outside air introduction port 6 and flows down through the drain pipe 31 is efficiently transported together with the bilge water flowing inside the bilge pipe 30. Can be drained outside.

FIG. 8 shows the construction of the connecting portion of the bilge pipe and the drain pipe in the second modification.
A drain pipe 36 is connected to an intermediate portion of 5, and a venturi portion 35a is formed on a portion of the bilge pipe 35 upstream of the drain pipe connecting portion. That is, by forming the venturi portion 35a in the bilge pipe 35,
When the bilge water pumped up from the ship bottom by the electric bilge passes through the venturi portion 35a, the flow velocity of the bilge water increases and the pressure in the venturi portion 35a decreases.

According to the second modification, the venturi portion 35a is provided at the upstream side of the drain pipe connecting portion of the bilge pipe 35.
As a result of negative pressure being generated in the venturi portion 35a of the bilge pipe 35, the water that has entered the air room 9 from the outside through the outside air introduction port 6 and flows down through the drain pipe 36, The bilge water flowing inside the bilge pipe 35 can be efficiently drained outboard.

FIG. 9 shows the construction of the connecting portion of the bilge pipe and the drain pipe in the third modified example.
A drain pipe 41 is connected to the middle portion of 0, and a check valve 42 is provided inside the drain pipe 41 above the bilge pipe connection portion. Further, the drain pipe 41
At the open end of the lower end portion 41a of the
3 is installed.

According to the third modification, since the check valve 42 is provided inside the drain pipe 41 above the bilge pipe connection portion, the water pumped up from the bottom of the ship by the electric bilge 23 is used for the bilge pipe 40. Through the drain pipe 41
It is possible to reliably prevent the phenomenon of backflow to the side.

[0034]

As described above, according to the ship drainage device of the first aspect of the invention, the bilge pipe for draining the water accumulated at the bottom of the ship to the outside of the ship and the outside air from the outside of the ship via the outside air inlet port. Since the drain pipe that drains the water that has entered the introduction chamber is connected and the drain port for the bilge pipe and drain pipe is shared, the water that has entered from the outside of the vessel through the outside air introduction port as in the past The drainage structure of the bilge water and the infiltrated water can be simplified as compared with the case where the drainage port of 1) and the drainage port of the water collected on the bottom of the ship are separately provided on the side surface of the hull. Moreover, since the inner diameter of the drain pipe is set to a size smaller than the inner diameter of the bilge pipe, and the connection portion between the drain pipe and the bilge pipe is set to a position between the outside air introduction port and the drain port,
The fluid resistance in the drain pipe can be made larger than the fluid resistance in the bilge pipe, and a height difference occurs between the drain pipe and the connection part of the bilge pipe and the drainage port.
As a result, the phenomenon that the water outside the ship flows back into the ship from the drain,
Alternatively, it is possible to prevent the phenomenon that the water pumped up from the ship bottom flows back to the outside air introduction chamber side through the drain pipe.

According to the ship drainage device of the first aspect of the present invention, for example, when bilge water does not flow inside the bilge pipe, a part of the water flowing into the drain pipe from the outside of the bilge pipe is It will be possible to supply to the pump for drainage from the bottom of the ship via the connection part between the drain pipe and the bilge pipe and the bilge pipe.
As a result, for example, when the ship bottom drainage pump is driven by a motor, it is also possible to cool the motor with water that has flowed from the drain pipe to the ship bottom drainage pump side through the bilge pipe to prevent heating of the motor. As a result, it is possible to extend the life of the motor.

According to the drainage device for a ship of the second aspect of the invention, the connection area of the bilge pipe with the drain pipe is set in an inverted U shape, and the connection part with the drain pipe is provided at the top of the bilge pipe. With this structure, it is possible to more reliably prevent the phenomenon that the water outside the ship flows back into the ship from the drain port, or the water drawn from the bottom of the ship flows back to the outside air introduction chamber side through the drain pipe. It has the effect of.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of a main part of a small jet propulsion watercraft according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a configuration in the vicinity of an outside air introduction port and an air room of the small jet propulsion watercraft according to the present embodiment.

FIG. 3 is an explanatory view showing a configuration of a small jet propulsion boat according to the present embodiment near a ship bottom and a side surface of a hull.

FIG. 4 is a front view of the small jet propulsion watercraft according to the present embodiment.

5 is a plan view of the small jet propulsion watercraft shown in FIG. 4. FIG.

FIG. 6 is an explanatory diagram showing a configuration of a connecting portion between the first and second bilge pipes and the drain pipe in the present embodiment.

FIG. 7 is an explanatory diagram showing a configuration of a connecting portion between a bilge pipe and a drain pipe in a first modified example.

FIG. 8 is an explanatory diagram showing a configuration of a connecting portion between a bilge pipe and a drain pipe in a second modified example.

FIG. 9 is an explanatory diagram showing a configuration of a connecting portion between a bilge pipe and a drain pipe in a third modified example.

FIG. 10 is a plan view of a small jet propulsion watercraft according to a conventional example.

FIG. 11 is an explanatory diagram showing a configuration near a ship bottom and a side surface of a hull of a small jet propulsion watercraft according to a conventional example.

FIG. 12 is an explanatory view showing the backflow of water from the outside of the vessel to the bilge pipe in the conventional example.

[Explanation of symbols]

 1 Hull 6 Outside air introduction port 9 Air room as outside air introduction chamber 21, 31, 36, 41 Drain pipe 24 First bilge pipe as bilge pipe 25 Union joint 26 Second bilge pipe as bilge pipe 28 Drainage port 30, 35 , 40 Bilge pipe 35a Venturi part 42 Check valve

Claims (2)

[Claims] 1. A drain pipe, which is connected to an outside air introducing chamber having an outside air introducing port opened at an upper portion of the hull, and drains water that has entered the outside air introducing chamber from outside the ship through the outside air introducing port, A ship drainage apparatus, comprising: a bilge pipe attached to a ship bottom drainage pump, for draining water accumulated on the ship bottom out of a ship through a drainage port, wherein the drainage port is provided in a lower portion of the hull. While connecting the drain pipe and the bilge pipe, the connection point between the drain pipe and the bilge pipe is set at a position between the outside air introduction port and the drain port, and the inner diameter of the drain pipe is the bilge pipe. A drainage device for a ship, characterized in that the size is set to be smaller than the inner diameter of the. 2. The connection area of the bilge pipe with the drain pipe is set in an inverted U shape, and a connection part with the drain pipe is provided at the uppermost part of the bilge pipe. The drainage device for ships according to claim 1.