JP3609475B2 - Watercraft - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a watercraft equipped with a catalytic converter.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a water-borne ship includes a water jet propulsion device that travels with a passenger seated on a hull seat and a steering handle. The water jet propulsion device has an engine mounted in an engine room in the hull and a jet pump disposed in a pump chamber on the rear side of the hull from the engine room.
[0003]
The engine intake device sucks air from the engine compartment and supplies it to the engine, and the exhaust device exhausts exhaust gas to the pump compartment at the rear of the hull. The engine chamber communicates with the atmosphere through an air circulation port provided in the hull, and the outside air is introduced into the engine chamber from the air circulation port when the intake device sucks air in the engine chamber. It was.
[0004]
[Problems to be solved by the invention]
In recent years, in order to prevent the exhaust gas discharged into the water from causing marine pollution and air pollution, it has been required to install a catalytic converter in the exhaust system.
[0005]
However, when the catalytic converter is mounted on the surface traveling boat, the position of the catalytic converter is a problem.
This is because, first of all, it must be taken into account that the catalytic converter is very hot. That is, because the exhaust device of the surface traveling ship is disposed in the hull, cooling by the traveling wind cannot be expected, and the catalytic converter excessively generates heat. In order to solve such a problem, it is conceivable to arrange the catalytic converter in the pump chamber at the rear part of the hull which is relatively low temperature. However, if this is done, the temperature of the exhaust gas flowing into the catalytic converter is lowered. This makes it difficult to reach the activation temperature.
[0006]
Secondly, since the catalytic converter is heavy, depending on the position of the catalytic converter, it may have an adverse effect on the turning performance during traveling.
Thirdly, since the surface watercraft may be overturned, depending on the arrangement position, the catalytic converter will be immersed in the water flowing backward from the exhaust outlet opening in the propeller chamber into the exhaust passage. When the catalytic converter is submerged, foreign substances in the water may adhere to the pores of the porous material carrying the catalytic metal.
[0007]
In such a case, even if the catalytic converter is dried and can be used again, the performance is degraded. In particular, when this surface traveling ship is used at sea, the hole portion is substantially filled with salt, and cannot be reused only by drying.
[0008]
The present invention has been made to solve such problems, and a first object of the present invention is to suppress an excessively high temperature when a catalytic converter is mounted on a surface traveling ship. A second object is to prevent the catalytic converter from being submerged even if the hull overturns and water flows backward from the exhaust outlet.
[0009]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a watercraft, wherein an air circulation port for introducing air into the hull is arranged spaced apart from one side of the hull in the front-rear direction of the hull. A fuel tank is arranged on the side, an exhaust pipe connected to the engine is extended between the engine and the air circulation port, and a catalytic converter is interposed in the extended portion.
[0010]
A surface-traveling ship according to a second aspect of the present invention includes an air circulation port for introducing air into the hull, spaced apart from the engine in the front-rear direction of the hull, and an exhaust pipe connected to the engine connected to the engine and the It extends between the air circulation port, and a catalytic converter is interposed in the extending portion, and the catalytic converter is positioned at a position closer to the bottom of the ship than the draft at the time of 180 ° rollover .
[0013]
[Action]
According to the first aspect of the invention, the relatively cool outside air that has flowed into the hull from the air circulation port flows toward the engine having the intake device, so that the outside air flows in the vicinity of the catalytic converter and cools it. . In particular, according to the present invention, the fuel tank does not block the air flow flowing in the vicinity of the catalytic converter.
[0014]
According to the second aspect of the invention, the relatively cool outside air that has flowed into the hull from the air circulation port flows toward the engine having the intake device, so that the outside air flows in the vicinity of the catalytic converter and cools it. . In particular, according to the present invention, the catalytic converter is disposed above the water surface when the hull rolls over 180 degrees.
[0016]
【Example】
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a sectional side view showing an engine portion of a surface traveling ship according to the present invention, FIG. 2 is a plan view showing a schematic configuration of the surface traveling ship according to the present invention, and FIG. 3 is a catalytic converter mounting portion in FIG. III-III line sectional view, FIG. 4 is a VV line sectional view in FIG.
[0017]
In these drawings, reference numeral 1 denotes a surface traveling ship according to this embodiment, and this surface traveling ship 1 travels with an occupant seated on a seat 3 of a hull 2 and holding a steering handle 4. Further, on the left and right sides of the seat 3, as shown in FIG. The hull 2 is provided with a bulkhead 7 that defines the inside of the hull 2 into a front engine chamber 5 and a rear pump chamber 6.
[0018]
8 is a water-cooled two-cycle two-cylinder engine, and 9 is a jet pump that constitutes a water jet propulsion apparatus together with the engine 8. These are mounted in the center in the left-right direction of the hull 2, the engine 8 is disposed in the engine chamber 5, and the jet pump 9 is disposed in the pump chamber 6.
[0019]
As shown in FIG. 3, the engine 8 has an intake device 10 connected to the right side of the hull of the crankcase 8a and an exhaust device 11 connected to the left side of the hull of the cylinder body 8b. The intake device 10 includes a carburetor 12 connected to the crankcase 8a via an intake pipe 10a, an intake silencer 13 connected to the upstream side of the carburetor 12, and an intake duct 15 having an air intake port 14 opened at the lower end. And consists of The intake device 10 sucks air in the engine chamber 5 substantially from the front of the cylinder body 8 b of the engine 8, mixes the air and fuel by the carburetor 12, and supplies the mixture to the engine 8. It has become. The fuel is configured to be supplied to the carburetor 12 from a fuel tank 16 (FIG. 1) disposed in the pump chamber 6 on the rear side of the hull from the engine 8.
[0020]
Further, since the intake device 10 sucks air in the engine compartment 5, the engine compartment 5 has a structure in which outside air is introduced from a front air circulation duct 17 and a rear air circulation duct 18 fixed to the hull 2. Yes. Openings 17a and 18a at the lower ends of both the ducts 17 and 18 constitute an air circulation port according to the present invention.
Both of these ducts 17 and 18 are positioned in the center of the hull 2 in the left-right direction, and are spaced apart from the engine 8 in the front-rear direction of the hull 2. The front air circulation duct 17 is disposed on the front end side of the hull 2, and the rear air circulation duct 18 is disposed immediately before the bulkhead 7. The front air circulation duct 17 has a lower end opened in the vicinity of the ship bottom 2b.
[0021]
The exhaust device 11 is connected to the cylinder body 8b of the engine 8 to connect the exhaust passage from the engine 8 to the left side of the hull, and is connected to the rear end of the lead-out portion 19. As shown in FIG. The exhaust pipe 20 is formed by being bent in a U-shape that is laterally viewed from the side so as to protrude toward the rear of the engine 2 and communicates with an upper front end of the exhaust pipe 20. An expansion tube 21 formed so as to extend to the front, a lower end of the front portion of the expansion tube 21 through a communication hose 22 as shown in FIG. 3, and a water lock 23 disposed on the right side of the hull from the engine 8; And a discharge pipe 24 that passes through the bulkhead 7 from the rear end of the water lock 23 and passes above the fuel tank 16 and communicates with the propeller chamber at the rear of the hull. It has a structure to discharge from the exhaust outlet 11a which is open to Pera chamber sidewall.
[0022]
The communication hose 22 is interposed between a metal bellows hose 22a on the left side of the hull connected to the expansion pipe 21, a metal bellows hose 22b on the right side of the hull connected to the water lock 23, and the hose 22a, 22b. And a catalytic converter 25. As shown in FIG. 4, the catalytic converter 25 is configured by fixing a honeycomb carrier 25b made of alumina or the like carrying a catalytic metal (not shown) inside a metal cylinder 25a. .
[0023]
The catalytic converter 25 has the bellows hoses 22a and 22b fitted and fixed to one end and the other end in the axial direction of the cylindrical body 25a, and the outer surface of the central portion in the axial direction between the bellows hoses is fixed. Exposed. The catalytic converter 25 is disposed at a central portion in the left-right direction of the hull 2 and closer to the bottom of the ship than the center in the vertical direction of the hull 2. The catalytic converter 25 is fixed to the hull 2 by a bolt inserted through a flange (not shown) provided integrally with the cylindrical body 25a.
[0024]
When the marine vessel 1 configured as described above starts the engine 8, the exhaust gas flows from the cylinder body 8b of the engine 8 into the expansion pipe 21 through the outlet portion 19 of the exhaust device 11 and the exhaust pipe 20, and is expanded here. After that, the air is discharged from the exhaust outlet 11a to the propeller chamber through the communication hose 22, the water lock 23 and the discharge pipe 24. The exhaust gas flows into the communication hose 22 and passes through the catalytic converter 25, whereby the harmful components contained therein are removed by burning.
[0025]
On the other hand, after the engine is started, the intake device 10 sucks air in the engine chamber 5, so that outside air flows into the engine chamber 5 through the front air circulation duct 17 and the rear air circulation duct 18. At this time, the outside air that has flowed into the hull 2 from the front air circulation duct 17 flows to the rear side of the hull substantially along the bottom of the ship as indicated by a two-dot chain line arrow in FIG. 14 is sucked into.
[0026]
Since the catalytic converter 25 is interposed between the engine 8 and the air circulation port (the lower end opening 17a of the front air circulation duct 17), the catalytic converter 25 is positioned on the air circulation path. The catalytic converter 25 is cooled by being exposed to a relatively low temperature outside air.
Therefore, even if the catalytic converter 25 is disposed in the engine chamber 5, it is possible to suppress excessive heat generation.
[0027]
In addition, since the outer surface of the catalytic converter 25 is exposed to the engine compartment 5, heat exchange is performed very efficiently when the air is cooled by being exposed to the air flow as described above. Can be cooled.
[0028]
Further, since the fuel tank 16 is arranged on the rear side of the hull from the engine 8, the air flow for cooling the catalytic converter 25 is not blocked by the fuel tank 16, so that the cooling efficiency is also increased from this point. There is also an advantage that the heat of the catalytic converter 25 is not transmitted to the fuel tank 16.
[0029]
Furthermore, since the catalytic converter 25 is positioned in the center of the hull 2 in the left-right direction, the catalytic converter 25 is disposed so that the left and right weights of the hull 2 are equal. It is not damaged by the converter 25.
[0030]
In addition, when the catalytic converter 25 is overturned so that the hull 2 is turned upside down, that is, at the site closer to the ship bottom 2b than the water line L2 at the time of 180 ° overturning, when the hull 2 overturns 180 °, The catalytic converter 25 is not submerged in the water flowing backward from the exhaust outlet 11a. This is because by arranging the catalytic converter 25 as described above, even if the hull 2 rolls over by 180 °, the catalytic converter 25 always exists above the water surface.
[0031]
The position of the water surface is indicated by two-dot chain lines L1 to L8 in FIG. L1 indicates the water surface position during normal operation when one person is on board and the engine is stationary, L2 indicates the water surface position when the hull 2 is turned over so that the hull 2 is turned upside down, and L3 indicates the hull is inclined downward to the left. L4 indicates a water surface position when the hull 2 is upside down so as to be submerged in water, and L4 indicates a water surface position when the hull 2 is inverted upside down and the hull left side is submerged in water.
[0032]
L5 indicates the water surface position when the hull is turned over so that the left side of the hull faces directly below, and L6 indicates the water surface position when the hull is turned over so that the right side of the hull faces directly below. L7 indicates a water surface position when the hull 2 is tilted downward and the right side of the hull is overturned so as to be submerged. L8 is when the hull 2 is upside down and the right side of the hull is overturned so that it is submerged. The water surface position is shown.
[0033]
That is, since the catalytic converter 25 is arranged so as to be positioned above the water line (L1 to L8) at any inclination angle, the catalyst converter 25 is always above the water surface even if the hull 2 rolls over in any direction. It is possible to prevent the catalytic converter 25 from being submerged in the water flowing backward from the exhaust outlet 11a because the converter 25 exists.
[0034]
【The invention's effect】
As described above, the watercraft according to the first aspect of the present invention has an air circulation port that introduces air into the hull, separated from the engine in the front-rear direction of the hull. Since the connected exhaust pipe extends between the engine and the air circulation port, and the catalytic converter is interposed in the extending portion, the relatively low temperature outside air flowing into the hull from the air circulation port is sucked into the intake device. By flowing toward the engine having the above, this outside air flows in the vicinity of the catalytic converter and cools it.
For this reason, when attaching a catalytic converter to a surface traveling ship, it can suppress that this becomes high temperature too much.
In addition, according to the present invention, the air flow port is disposed on one side of the hull longitudinal direction with respect to the engine, and the fuel tank is disposed on the other side of the hull longitudinal direction with respect to the engine. The fuel tank does not block the flow. For this reason, since the catalytic converter is easily exposed to the air flow, it can be more reliably cooled.
[0035]
A surface-traveling ship according to a second aspect of the present invention includes an air circulation port for introducing air into the hull, spaced apart from the engine in the front-rear direction of the hull, and an exhaust pipe connected to the engine connected to the engine and the Because it extends between the air circulation port and a catalytic converter is installed in this extension, the relatively cool outside air that flows into the hull from the air circulation port flows toward the engine having the intake device. The outside air flows in the vicinity of the catalytic converter and cools it.
For this reason, when attaching a catalytic converter to a surface traveling ship, it can suppress that this becomes excessively high temperature.
In particular, according to the present invention, since the catalytic converter is positioned at a position closer to the bottom of the ship than the draft line when the hull is turned over 180 °, the catalytic converter is disposed above the water surface when the hull is turned over 180 °. However, even if 180 degrees overturns and water flows backward from the exhaust outlet, the catalytic converter is not submerged.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a cutaway engine portion of a watercraft according to the present invention.
FIG. 2 is a plan view showing a schematic configuration of a watercraft according to the present invention.
3 is a cross-sectional view taken along line III-III of the catalytic converter mounting portion in FIG.
4 is a cross-sectional view taken along line VV in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Surface traveling ship, 2 ... Hull, 5 ... Engine room, 7 ... Bulkhead, 8 ... Engine, 10 ... Intake device, 11 ... Exhaust device, 12 ... Vaporizer, 14 ... Air inlet, 21 ... Expansion pipe, 22 ... Communication hose, 23 ... Water lock, 25 ... Catalytic converter, L1-L8 ... Water surface.

Claims (2)

An air circulation port for introducing air into the hull is arranged apart from the engine on one side in the front-rear direction of the hull, and a fuel tank is arranged on the other side in the front-rear direction of the hull with respect to the engine. A surface traveling ship characterized in that a connected exhaust pipe extends between an engine and the air circulation port, and a catalytic converter is interposed in the extending portion. An air circulation port for introducing the atmosphere into the hull is arranged separately from the engine in the front-rear direction of the hull, and an exhaust pipe connected to the engine extends between the engine and the air circulation port, A surface traveling ship characterized in that a catalytic converter is interposed in the extending portion, and the catalytic converter is positioned at a position closer to the bottom of the ship than the waterline at the time of 180 ° rollover .

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