JP2003003841A - Muffler for marine engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such problems that in a conventional muffler, the space for the muffler or mounting thereof is required inside a hull, an unusable space occurs due to the installation of the muffler, a brace is needed to support the muffler and further, since the muffler is integrally fixed to the inside of the hull, maintenance such as cleaning of the muffler inside is unavailable. SOLUTION: The muffler is composed of a hull outer plate 19 and a sound- muffling case 20 arranged on a stem outside. The sound-muffling case 20 is formed in a U shape in a plan view and is detachably fixed to the hull outer plate 19 by a fixing means such as a bolt so as to cover an opening 21. An exhaust pipe hole 22 is bored on the rear face of the sound-muffling case 20 to discharge an exhaust gas therefrom.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a silencer for reducing exhaust noise of an engine of a ship or the like.

[0002]

2. Description of the Related Art Conventionally, there has been known a technique of attaching a silencer for reducing an engine exhaust sound to a part of an exhaust pipe. For example, a part of the exhaust pipe inside the hull is cut, and a silencer is arranged at the cut portion via a rubber hose or the like.
The silencer is configured to be supported by a column or the like. Also,
The technique disclosed in Japanese Patent Publication No. 10-504256 is also known.

[0003]

However, the conventional muffler requires a space for the muffler and a space for mounting the muffler inside the hull, and there is a space that cannot be used due to the arrangement of the muffler, or the muffler is supported. There was a problem such as the need for a supporting column. Further, since the muffler is integrally mounted inside the hull, maintenance such as internal cleaning of the muffler could not be performed. Furthermore, it was necessary to provide advanced installation work and sufficient equipment so that the cooling water flowing through the exhaust pipe did not leak inside the hull from the connection between the exhaust pipe and the silencer.

[0004]

The problem to be solved by the present invention is as described above, and the means for solving this problem will be described below.

That is, according to the first aspect of the present invention, in a silencer for silencing exhaust noise of an engine mounted on a ship, a silencer is provided by a main body and a part of the hull outer plate which are separate from the hull outer plate. It is what constitutes.

According to a second aspect of the present invention, in a silencer for silencing exhaust noise of an engine mounted on a ship, a recess is formed in a part of a hull outer plate, and the recess serves as a space required for silencing. .

In the third aspect, in the recess,
The recess is a part of the space required for silencing.

According to the present invention, the main body can be detached from the outer plate of the hull.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described. 1 is a schematic side view showing the overall structure of the ship, FIG. 2 is a plan view of the ship shown in FIG. 1, and FIG. 3 is a side view showing a muffler in which a sound deadening case is fixedly mounted on the outer plate of the hull. 4 is a rear view of the muffler in FIG. 3, FIG. 5 is a side view showing the muffler configured by inserting a muffler case into a recess formed in a part of the hull, and FIG. 6 is a rear view of the muffler in FIG. 7 is a side view showing a silencer in which a recess formed in a part of the hull is configured as a silencing space, and FIG. 8 is a rear view of the silencer in FIG. 7.

A schematic structure of a shaft ship which is an embodiment of the ship according to the present invention will be described. As shown in FIG. 1, a ship has an engine 2 in a hull 1, and the engine 2
A propeller 4 is attached to the tip of a propeller shaft 3 extending obliquely downward and rearward from the propeller shaft 3 so that the propeller shaft 3 can be driven by the driving force of the engine 2. A rudder 5 is arranged at the rear end of the bottom of the hull 1,
By turning the rudder 5 left and right, it is possible to go straight, change the course and turn. Further, a muffling case 20 for reducing the exhaust sound of the engine 2 is arranged at the rear part of the hull 1.
The present invention reduces the engine exhaust sound of a ship and is not limited to a shaft ship or a drive ship.

As shown in FIG. 2, an anchor store 6 is arranged in the front part of the hull 1, and a container 7, a cage 8 and the like are arranged behind the anchor store 6 and behind it. A bridge 10 is arranged at a substantially central position on the left and right of the hull 1. The bridge 10 is provided with a marine vessel seat 15 and the like. The front side of the marine vessel seat 15 is provided by a front windshield 11, the left and right sides are provided by bridge sides 14, 14 and side windows 12, 12, and the upper side is provided by an upper cover 1.
The bridge 10 is formed by being covered with 3.

A passage 1 is provided on the left and right sides of the bridge 10.
8 and 18 are formed so that the right and left side portions of the bridge 10 can be passed through, and the front side and the rear side of the hull 1 can be moved via the passage 18.

Next, the silencer of the present invention will be described.
First, the arrangement structure of the silencer in the ship shown in FIGS. 1 and 3 will be described. An engine 2 is arranged inside the hull 1, and exhaust gas discharged from the engine 2 passes through an exhaust pipe 16 and is discharged from an opening 21 at the stern. As a first embodiment, as shown in FIGS. 3 and 4, the silencing case 20 is arranged at the stern,
The hull outer plate 19 constitutes a silencer. The muffling case 2
0 is formed in a U shape in a plan view and has a configuration in which the bottom surface is closed. The muffling case 20 is arranged so as to cover the opening 21. And the muffling case 20
An exhaust pipe hole 22 is formed in the rear surface of the rear surface, and exhaust gas is discharged from the exhaust pipe hole 22. The muffling case 20 is detachably fixed to the hull outer plate 19 by a fixing means such as a bolt.

Partition plates 23, 23 are erected between the exhaust pipe hole 22 and the opening 21. A plurality of partition plate holes 23a, 23a ... Are opened in the partition plate 23, and the exhaust gas passes through the partition plate hole 23a so that the exhaust sound is silenced. In the present embodiment, the sound deadening structure is configured to mute the partition plate 23 by standing up the partition plate 23 and forming the partition plate hole 23a in the partition plate 23, but the present invention is not limited to this. The number of partition plates 23 and the spacing between them can be adjusted according to the configuration of the engine mounted. In addition to the partition plate 23, a sound absorbing material or the like can be disposed as the component disposed in the sound deadening case 20.

In this way, the hull skin 19 and the muffler case 2
By configuring the muffler with 0, the space for the muffler in the hull can be omitted, and support members such as stanchions are not required, and the cost can be suppressed. Further, since the muffler is arranged outside the hull, it is possible to prevent the cooling water of the exhaust pipe from entering the inside of the ship. Noise reduction case 20 on the outside of the hull
Since the hull outer plate 19 is used as the upper surface and the front surface of the muffler expansion chamber, exhaust gas is discharged to the outside of the hull even when the muffler case 20 is damaged, and safety can be ensured. Since the expansion chamber is constituted by the hull outer plate 19 and the muffler case 20, the volume of the expansion chamber can be increased and the weight of the muffler can be reduced. Hull skin 1
Since 9 is diverted as a part of the silencer, the cost of the silencer can be reduced. Further, the silencer case 20 can be attached to a conventional ship to easily configure the silencer. Since the opening 21 is provided behind the exhaust pipe hole 22 and the exhaust gas discharge path is directed from the bow to the stern, the sound deadening effect is improved and the exhaust gas discharge resistance can be reduced.

As a second embodiment, as shown in FIGS. 5 and 6, an opening is provided in a part of the rear side surface of the hull, and a muffling case 20 is fitted in the opening to construct a muffler. In the second embodiment, the sound deadening case 20 has a configuration in which a quadrangular surface of a semi-cylinder is connected to a side surface of the quadrangular prism, and a rib is provided on the side opposite to the connected side of the semi-cylinder. Exhaust gas discharged from the engine passes through the front exhaust pipe 16a and is fed into the noise reduction case 20 through the front exhaust pipe hole 32a. The front exhaust pipe hole 32a is formed in the front surface of the noise reduction case 20, and one end of the front exhaust pipe 16a is fitted therein.
The rear exhaust pipe hole 32b is formed in the rear surface of the noise reduction case 20, and one end of the rear exhaust pipe 16b is fitted in the rear exhaust pipe hole 32b. The exhaust gas silenced by the muffling case 20 is fed into the rear exhaust pipe 16b through the rear exhaust pipe hole 32b, and is discharged out of the ship through the opening 21 provided at the stern. In the second embodiment, the side surface of the silencing case 20 located outside the hull is used as the hull side surface. Further, the sound deadening case 20 is provided with a rib, and the rib allows positioning when the sound deadening case 20 is inserted into the opening on the side surface of the hull.

Further, in the second embodiment, a concave portion is provided on the side surface of the hull, and the opening of the concave portion is closed by a lid body having a shape along the side surface of the hull, whereby the concave portion provided on the side surface of the hull is provided with a space for noise reduction. It can be used as. The inner part of the hull of the sound deadening case 20 in the second embodiment is formed by a recess provided on the side surface of the hull, and the front exhaust pipe 16a and the rear exhaust pipe 16b are formed in the recess as described above.
By connecting the above, the concave portion on the side surface of the hull is used as an expansion chamber for silencing. In addition, instead of forming the concave portion on the side surface of the hull 1, a sound deadening case 20 having a side surface open to the inner side surface of the hull 1 is detachably attached by a fixing means such as a bolt, and the inner side surface of the hull 1 and the sound deadening case are attached. 20
The silencer can be configured with and. At this time, the inner side surface of the hull 1 serves as a lid for the muffling case 20. The internal structure of the muffling case is the same as that of the first embodiment in FIGS. 3 and 4 described above. Thus, the recess is formed on the side surface of the rear part of the hull 1, and
Since the muffler is inserted into the recess to configure the muffler, the muffling space inside the hull can be made small without changing the shape of the hull, and a pillar or the like for supporting the muffler is not required and the structure is simple. Can be

As a third embodiment, as shown in FIGS. 7 and 8, a recess 42 is formed in a part of the bottom of the ship at the rear of the hull, the recess 42 is closed by a lid, and the recess 42 is provided with a silencing space 43. To configure. The recess 42 has a configuration in which it is recessed upward on the rear side of the ship bottom, and the opening of the recess 42 is closed by a lid. The lid is attached to the bottom of the ship, and has a configuration that follows the shape of the bottom of the ship. The recess 4
2. An exhaust pipe hole 41 is formed in the front surface of the exhaust pipe 16, one end of the exhaust pipe 16 is fitted therein, and exhaust gas from the exhaust pipe 16 is fed into the recess 42. The exhaust gas silenced in the recess 42 is provided with an opening 21 to the outside of the ship on the rear surface of the recess 42.
Discharged from the ship. The internal structure of the recess 42 of the silencer is the same as that of the first embodiment shown in FIGS. 3 and 4.

As described above, since the recess 42 is formed in the bottom of the ship and the interior of the recess 42 is used as a sound deadening space 43 and is closed by the lid, the space required for sound deadening is reduced in the hull without changing the shape of the bottom of the ship. can do. Further, by removing the lid, the silencer can be disassembled, and the recess 42
You will be able to perform maintenance such as cleaning the inside.

[0020]

Since the present invention is constructed as described above,
The following effects are achieved.

That is, as described in claim 1, in a silencer for silencing exhaust noise of an engine mounted on a ship, the silencer includes a main body and a part of the hull outer plate which are separate from the hull outer plate. Therefore, the silencer can be attached to the outside of the hull, and there is no danger of the cooling water of the exhaust pipe infiltrating into the ship.

According to the second aspect of the present invention, in the silencer for silencing the exhaust noise of the engine mounted on a ship, a recess is formed in a part of the outer plate of the hull, and the recess is a space required for silencing. By making the hull part of the muffler constituent members, the space for the muffler in the ship can be reduced, leading to cost reduction.

According to a third aspect, in the recess,
Since the concave portion is a part of the space necessary for silencing, the hull can be a part of the constituent member of the silencing device, and the space of the silencing device in the ship can be reduced.

Since the main body can be removed from the outer plate of the hull as described in claim 4, it is possible to disassemble, and maintenance such as cleaning of the inside of the silencer can be performed.

[Brief description of drawings]

FIG. 1 is a schematic side view showing the overall configuration of a ship.

FIG. 2 is a plan view of the ship shown in FIG.

FIG. 3 is a side view showing a silencer configured by fixing a silencer case to the outer plate of the hull.

FIG. 4 is a rear view of the silencer in FIG.

FIG. 5 is a side view showing a silencer configured by fitting a silencer case into a recess formed in a part of the hull.

FIG. 6 is a rear view of the silencer in FIG.

FIG. 7 is a side view showing a silencer in which a recess formed in a part of the hull is configured as a silencing space.

FIG. 8 is a rear view of the silencer in FIG.

[Explanation of symbols]

1 hull 2 engine 16 Exhaust pipe 20 silence cases

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshikazu Senda             One of 6449 Ushimado, Ushimado-cho, Oku-gun, Okayama Prefecture             Nmmer Shipbuilding Co., Ltd. F-term (reference) 3G004 AA05 BA01 CA07 DA07 DA13                       GA01

Claims (4)

[Claims] 1. A silencer for silencing exhaust noise of an engine mounted on a ship, characterized in that the silencer is composed of a main body and a part of the hull outer panel which are separate from the hull outer panel. A silencer for a marine engine. 2. A silencer for silencing exhaust noise of an engine mounted on a ship, characterized in that a recess is formed in a part of a hull outer plate, and the recess is a space required for silencing. Engine silencer. 3. The silencer for a marine engine according to claim 2, wherein in the recess, the recess is a part of a space required for silencing. 4. The silencer for a marine engine according to claim 1 or 2, wherein the main body is detachable from the hull outer plate.