JP3225727B2 - Ship drainage system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage device for a marine vessel mounted on a small jet propulsion boat and the like, and more particularly, to a simplified drainage structure for water accumulated at the bottom of a boat or water entering the inside of a boat through an outside air inlet. The present invention relates to a drainage device for a marine vessel that is suitable for such cases.

[0002]

2. Description of the Related Art Heretofore, small jet propulsion boats have been widely used in which jet water jets are jetted rearward of a stern by a jet pump provided inside a stern-side hull and propelled. FIG.
Shows an example of a conventional small jet propulsion boat,
The small jet propulsion boat includes a hull 50, operation handles 51, 52 provided at a central portion of the hull 50, a driver seat 53 provided at a rear portion of the hull 50, and a hull 50.
And an outside air inlet 54 for introducing outside air for inhaling the engine from outside the boat into the engine room.

Further, an air room 55 communicating with the outside air inlet 54 is provided inside the front part of the hull 50, and the outside air introduced from outside the boat via the outside air inlet 54 is provided in the air room. The air is supplied to the inside of the engine room through an air duct (not shown) connected to the engine 55. In addition, when the outside air is introduced from outside the boat, water may enter at the same time through the outside air inlet 54, so that the water entering from the outside air inlet 54 is separated from the outside air inside the air room 55. The air is discharged out of the boat through a drain pipe connected to the air room 55.

FIG. 11 shows the internal structure of the conventional small jet propulsion boat near the ship bottom and the side of the hull. The ship bottom 57 has an electric motor comprising a bilge pump for pumping bilge water accumulated on the ship bottom 57 and a bilge pump drive motor. A bilge 58 is installed, and the 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 by the bilge pump of the electric bilge 58 with the start of the engine is passed through the bilge pipe 59 to the hull side surface 6.
The bilge water discharge port 61 is discharged out of the ship. In addition, the water that has entered the above-described air room 55 is drained out of the boat from the ingress water discharge port 62 of the hull side surface section 60 via the drain pipe 56.

[0005]

However, in the above-mentioned conventional small jet propulsion boat, the hull side 6
Since the bilge water discharge port 61 and the infiltration water discharge port 62 are respectively provided at 0 and the bilge water discharge system and the infiltration water discharge system are separate systems, there is a problem that the drainage structure is complicated. Further, since the electric bilge 58 is driven in conjunction with the start of the engine and stopped when the engine is stopped, for example, as shown in FIG. When the outlet 61 is below the waterline (ie, below the water surface S), there is a problem that the water W flows back into the bilge pipe 59 through the bilge water outlet 61. Further, as described above, since the electric bilge 58 is driven in conjunction with the start of the engine, even if the bilge water runs out at the bottom of the ship, the electric bilge 58 continues to be driven while the engine is driving. There is a problem that the bilge pump drive motor is heated.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned disadvantages of the prior art, and in particular to simplify the drainage structure of water accumulated at the bottom of a ship or water entering from an outside air inlet, and to reduce the amount of water flowing into the ship from the drain. It is an object of the present invention to provide a marine drainage device which achieves prevention of backflow of water and backflow of water pumped from a ship bottom to a drain pipe.

[0007]

According to a first aspect of the present invention, there is provided an outside air introduction chamber having an outside air introduction port opened at an upper portion of a hull, and connected to the outside air introduction chamber through the outside air introduction port from outside the ship. A drain pipe for draining water that has entered the chamber, and a bilge pipe attached to the bottom drainage pump and draining water accumulated at the bottom of the boat to the outside of the boat via a drain port, wherein the drain port is located below the hull. In the marine drainage device provided in the 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 be smaller than an inner diameter of the bilge pipe. Has been adopted. This aims to achieve the above-mentioned object.

According to a 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 a connection portion with the drain pipe is provided at the top of the bilge pipe. It has a configuration.

[0009]

According to the first aspect of the present invention, a bilge pipe for draining water accumulated at the bottom of a ship to the outside of a ship and a drain pipe for draining water entering the outside air introduction chamber from outside of the ship via an outside air inlet are provided. The bilge water and the infiltration water can be drained out of the boat through the common drain port because the bilge pipe and the drain pipe have a common drain port. Thereby, the drainage structure of the bilge water and the intruding water can be simplified. In addition, the inner diameter of the drain pipe is set smaller than the inner diameter of the bilge pipe, and the connection point between the drain pipe and the bilge pipe is set at a position between the outside air inlet and the drain port. Can be made higher than the fluid resistance in the bilge pipe, and a height difference occurs between the drain pipe and the connection portion of the bilge pipe and the drain port. This can prevent a phenomenon in which the water outside the boat flows backward from the drain port into the boat, or a phenomenon in which the water pumped from the bottom of the boat flows back into the outside air introduction chamber through the drain pipe. For example, when the bilge water is not flowing inside the bilge pipe, a part of the water flowing into the drain pipe from the outside of the bilge pipe is drained to the bottom of the bilge pipe via the connection part between the drain pipe and the bilge pipe. As a result, for example, when the bottom drainage pump is driven by a motor, the motor is cooled by water supplied from the drain pipe to the bottom drainage pump through the bilge pipe. Heating of the motor can be prevented, and as a result, the life of the motor can be extended.

According to the second aspect of the present invention, the connection area between the bilge pipe and the drain pipe is set in an inverted U-shape, and a connection portion with the drain pipe is provided at the top of the bilge pipe. Therefore, the phenomenon in which the water outside the boat flows backward from the drain port into the ship, or the phenomenon in which the water pumped from the bottom of the boat flows backward through the drain pipe to the outside air introduction chamber side can be further reliably prevented.

[0011]

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

First, the appearance of a small jet propulsion boat according to this embodiment will be described with reference to FIGS. 4 and 5. The small jet propulsion boat has a hull 1 and operation handles 2 provided at a substantially central portion of the hull 1. 3 and a driver's seat 4 and the like provided on the rear portion of the hull 1. Further, an outside air inlet 6 for introducing outside air for inhaling the engine into the ship from outside the ship is provided substantially at the center of the hull 1 and near the operation handle mounting portion 5. The arrangement position of the outside air inlet 6 is set at a high position on the hull 1 in order to minimize the amount of water entering the air room described below from outside the ship via the outside air inlet 6.

Next, the structure of the main part of the small jet propulsion boat according to the embodiment will be described with reference to FIGS. 1 to 3 and FIG. 6. As shown in FIG. An air room 9 surrounded by the partition wall member 7 and the hull cover 8 is provided in a state of communicating with the outside air introduction port 6, and the lower wall surface 7 a 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 portions 9a and second air room portions 9b via a wall member 10, and these first and second air room portions 9a and 9b are The communication state is established through the opening 11 of the wall member 10.

A fuel tank 12 is arranged inside the hull 1 and below the air room 9.
Inside the engine room 13 below the driver's seat 4, an engine 16 having 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 a lower opening portion 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 from outside the boat into the air room 9 via the outside air introduction port 6 into the engine room 13 as air for engine intake. Thus, the outside air introduced into the engine room 13 is sucked into the carburetor 15 of the engine 16 via the silencer / flame arrester unit 20.

A hole 7c is formed in the vertical wall surface 7b on the rear side of the hull of the partition wall member 7, and the upper end of the air duct 19 is connected to the partition wall member 7.
The second air room 9 of the air room 9 through the hole 7c
b. Further, a hole 7d is formed at a location where the lower wall surface 7a and the vertical wall surface 7b intersect with each other in the partition wall member 7, and an air room is formed in the hole 7d from outside of the boat via the outside air inlet 6. A drain pipe 21 for draining water that has entered the pipe 9 is connected to the drain pipe 21. 2 indicate the flow of the outside air G, and the solid arrows indicate the flow of the infiltrating water W.

As shown in FIG. 3, an electric bilge 23 comprising a bilge pump for pumping bilge water accumulated in the hull 22 and a bilge pump drive motor is installed on the bottom 22 of the hull 1. As shown in FIG. A first bilge pipe 24 is connected to the bilge pump of the electric bilge 23, and a second bilge pipe 26 and the aforementioned drain pipe 21 are connected to the first bilge pipe 24 via a T-shaped union joint 25. (See FIG. 6). As the union joint 25, a Y type joint may be used. The second bilge pipe 26 is connected to a drain port 28 provided on a hull side surface (side) 27.
Drain pipe 21 in first and second bilge pipes 24 and 26
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 of the bottom 22 pumped by the bilge pump of the electric bilge 23 with the start of the engine 16 is discharged out of the boat from the drain port 28 through the first bilge pipe 24 and the second bilge pipe 26. I have. In addition, water that has entered the inside of the air room 9 from outside the ship via the outside air inlet 6 is discharged out of the ship from the drain port 28 via the drain pipe 21 and the second bilge pipe 26, and the drain pipe 21. The power is supplied to the electric bilge 23 via the first bilge pipe 24.

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

When outside air is introduced into the first air room portion 9a of the air room 9 from outside of the boat through the outside air introduction port 6 of the hull 1 during traveling of the small jet propulsion boat, the first air room portion 9a The outside air inside is introduced into the second air room 9 b through the opening 11 of the wall member 10,
After being introduced into the inside of the air duct through the upper opening end 19 a of the air duct 9, it is introduced into the engine room 13 from the lower opening end 19 b of the air duct 19. 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 unit 20.

At this time, if water intrudes into the first air room 9a of the air room 9 from outside through the outside air inlet 6 of the hull 1 together with the outside air, the water that has entered is inclined by the inclination of the partition wall member 7. It flows along the lower wall surface 7a and flows into the drain pipe 21 which is connected to the hole 7d of the partition wall member 7. The water that has flowed into the drain pipe 21 passes through the second bilge pipe 26 via the union joint 25 and is drained out of the boat from the drain port 28 of the hull side surface 27. In this case, if there is no water inside the first and second bilge pipes 24 and 26, the drain pipe 2
A part of the water in 1 passes through the first bilge pipe 24 and the electric bilge 2
It flows down to the 3rd side. Thereby, the bilge pump drive motor of the electric bilge 23 is cooled by the water that has flowed down to the electric bilge 23 side through the first bilge pipe 24, so that the bilge pump drive motor can be prevented from being heated.

At this time, since the engine 16 is being driven when the small jet propulsion boat is traveling, the electric bilge 23 is also driven in conjunction with the driving of the engine 16. Along with this, the water collected by the bilge pump driven by the bilge pump drive motor of the electric bilge 23 and accumulated on the ship bottom 22 and the water flowing down the drain pipe 21 form the first bilge pipe 24 and the second bilge pipe 26. Through the drain port 28 to the outside of the ship. In this case, the water flowing down from the drain pipe 21 to the electric bilge 23 is also drained at the same time.

Also, when the small jet propulsion boat is traveling, the electric bilge 23 is driven and the inner diameter of the drain pipe 21 is reduced even if the drain port 28 of the hull side 27 becomes lower than the waterline. The dimensions are set to be smaller than the inner diameters of the first and second bilge pipes 24 and 26 and
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 inlet 6, the drain pipe 21 and the first and second bilge pipes 24 and 26 are provided. There is a difference in height between the connecting portion of the nozzle and the drain port. As a result, the phenomenon that the water outside the ship flows backward from the drain port 28 into the ship,
This prevents the water pumped from the bottom of the ship from flowing back to the air room 9 via the drain pipe 21.

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

Further, according to this embodiment, the connection area between the first and second bilge pipes 24 and 26 and the drain pipe 21 is set in an inverted U-shape, and the inner diameter of the drain pipe 21 is set to the first and second bilge pipes.
Since the size is set to be smaller than the inner diameter of the bilge pipes 24 and 26, and the connection point between the drain pipe 21 and the first and second bilge pipes 24 and 26 is set above the drain port 28, the drain pipe is used. The first and second fluid resistances inside 21 are
The fluid resistance in the bilge pipes 24 and 26 can be made larger than the fluid resistance, and the drain pipes 21 and the first and second
A difference in elevation occurs between the connection portion of the bilge pipes 24 and 26 and the drainage port, and as a result, water outside the boat is discharged to the drainage port 28.
It is possible to prevent the phenomenon that water flows backward from the boat into the ship and the phenomenon that water pumped from the bottom of the ship flows backward to the air room 9 via the drain pipe 21.

Further, according to the present embodiment, when bilge water does not flow through the first and second bilge pipes 24 and 26, a part of the water flowing into the drain pipe 21 from outside the boat is removed. , The drain pipe 21 and the first bilge pipe 24 to supply the electric bilge 23 with the bilge pump driving motor of the electric bilge 23.
It is possible to cool with water flowing down from 1 through the first bilge pipe 24. This makes it possible to prevent the bilge pump driving motor from being heated, and 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.

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

According to the first modification, since the open end 31b of the lower end 31a of the drain pipe 31 is arranged so as to be directed downstream in the bilge pipe 30, the drain pipe connection inside the bilge pipe 30 is performed. As a result of the occurrence of a negative pressure in the portion, water flowing into the air room 9 from the outside of the ship via the outside air inlet 6 and flowing down through the drain pipe 31 is efficiently discharged together with bilge water flowing inside the bilge pipe 30. Can be drained out.

FIG. 8 shows a configuration of a connecting portion of the bilge pipe and the drain pipe in the second modified example.
A drain pipe 36 is connected to an intermediate portion of 5, and a venturi portion 35 a is formed in a part of the bilge pipe 35 upstream of the drain pipe connection point. That is, by forming the venturi portion 35a in the bilge pipe 35,
When the bilge water pumped from the ship bottom by the electric bilge passes through the venturi section 35a, the flow rate of the bilge water increases and the pressure in the venturi section 35a decreases.

According to the second modification, the venturi portion 35a is provided in the bilge pipe 35 at the upstream side of the drain pipe connection point.
As a result, a negative pressure is generated in the venturi portion 35a of the bilge pipe 35, and as a result, water that intrudes into the air room 9 from the outside of the bilge via the outside air inlet 6 and flows down through the drain pipe 36, The bilge water flowing inside the bilge pipe 35 can be efficiently drained to the outside of the ship.

FIG. 9 shows a configuration of a connecting portion of a bilge pipe and a drain pipe in a third modified example.
A drain pipe 41 is connected to an intermediate portion of 0, and a check valve 42 is provided inside the drain pipe 41 above a bilge pipe connection point. Further, the drain pipe 41
A filter 4 for dust removal is provided at the open end of the lower end 41a of the filter.
3 is attached.

According to the third modification, since the check valve 42 is provided inside the drain pipe 41 above the bilge pipe connection point, the water pumped from the bottom of the ship by the electric bilge 23 is used for the bilge pipe 40. Through the drain pipe 41
The phenomenon of backflow to the side can be reliably prevented.

[0034]

As described above, according to the marine drainage device of the first aspect of the present 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. A drain pipe that drains water that has entered the introduction chamber is connected to the drain pipe, and the bilge pipe and drain pipe have a common drain port. The drainage structure of the bilge water and the infiltration water can be simplified as compared with the case where the drainage port of the hull and the drainage port of the water collected at the bottom of the ship are separately provided on the side surface of the hull. In addition, the inner diameter of the drain pipe is set to be smaller than the inner diameter of the bilge pipe, and the connecting point between the drain pipe and the bilge pipe is set at a position between the outside air inlet and the drain.
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 outboard water flows backward from the drain port into the ship,
Alternatively, it is possible to prevent the water pumped from the bottom of the ship from flowing back to the outside air introduction chamber through the drain pipe.

According to the drainage device for a marine vessel of the first aspect of the invention, for example, when bilge water is not flowing inside the bilge pipe, a part of the water flowing into the drain pipe from outside the boat is removed. It is possible to supply to the bottom drainage pump side through the connection part between the drain pipe and the bilge pipe and the bilge pipe,
As a result, for example, when the bottom drainage pump is driven by a motor, it is also possible to prevent the motor from being heated by cooling the motor with water flowing down from the drain pipe to the bottom drainage pump through the bilge pipe, This has the effect of extending the life of the motor.

According to the drainage device for a marine vessel 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 section with the drain pipe is provided at the top of the bilge pipe. With this structure, it is possible to more reliably prevent the outboard water from flowing backward from the drain port into the ship, or the water from the bottom of the ship backflowing to the outside air introduction chamber through the drain pipe. The effect is as follows.

[Brief description of the drawings]

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

FIG. 2 is an explanatory view showing a configuration near an outside air inlet and an air room of the small jet propulsion boat in the embodiment.

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

FIG. 4 is a front view of the small jet propulsion boat in the embodiment.

5 is a plan view of the small jet propulsion boat shown in 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 connection 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 connection 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 conventional small jet propulsion boat.

FIG. 11 is an explanatory view showing a configuration near the bottom of a boat and a side surface of a hull of a small jet propulsion boat in a conventional example.

FIG. 12 is an explanatory view showing a back flow of water from outside a boat to a bilge pipe in a conventional example.

[Explanation of symbols]

 Reference Signs List 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 drain port 30, 35 , 40 Bilge pipe 35a Venturi part 42 Check valve

Claims (2)

(57) [Claims] A drain pipe connected to an outside air introduction chamber having an outside air introduction port opened in an upper part of a hull, and draining water entering the outside air introduction chamber from outside the vessel via the outside air introduction port; A bilge pipe attached to the bottom drainage pump and configured to drain water accumulated at the bottom of the hull to the outside of the hull via a drain port, wherein the drain port is provided in a lower portion of the hull; A drain pipe and the bilge pipe are connected, and a connection point between the drain pipe and the bilge pipe is set at a position between the outside air inlet and the drain port, and an inner diameter of the drain pipe is set to the bilge pipe. A drainage device for ships, characterized in that the size is set to be smaller than the inner diameter of the ship. 2. A connection area between the bilge pipe and the drain pipe is set in an inverted U-shape, and a connection section with the drain pipe is provided at an uppermost part of the bilge pipe. The marine drainage device according to claim 1.