JP2009197590A - Silencer and manufacturing method of silencer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a silencer capable of reducing a manufacturing cost by standardizing a basic structure. <P>SOLUTION: The silencer is provided with a case 21 composed of a cylinder body 21a and end plates 21b, 21c for blocking openings of the cylinder body 21a, separation plates 30 arranged in the case 21 composed of a longitudinal plate 30a and a side plate 30b, an inlet hole 22a for introducing gas to the case 21 and an outlet hole 23a for discharging the gas from the case 21. The separation plates 30 divide the case into two or more chambers 31 and at least two of the chambers 31 communicate with each other by communication holes 32 formed at the separation plates 30. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a silencer for reducing the generated sound of exhaust gas, and more particularly to a silencer that can reduce manufacturing cost and a method for manufacturing the same.

  2. Description of the Related Art Conventionally, a silencer has a partition wall, a pipe, and the like disposed in a room surrounded by an outer shell and an end plate, and constitutes an exhaust gas flow path and a chamber. The noise reduction of the exhaust gas is tuned by the number of pipes, the length, the pipe diameter, the number of partition walls, the shape of holes provided in the partition walls, and the like. Note that. Generally, stainless steel is used as the material.

As a silencer having such a structure, there is known a silencer in which a partition is provided in a cylindrical shell to form a plurality of chambers, the chambers are connected by pipes, and a part of the chambers is filled with a sound absorbing member. (See Patent Document 1).
JP 2006-233862 A

  The silencer as described above needs to be tuned for the silencing performance in accordance with the characteristics of the target vehicle, internal combustion engine, or the like. For tuning, it is necessary to change the silencing structure such as pipes, partitions, and sound absorbing members in the silencer.

  For this reason, the silencer requires one structure for each target vehicle (for example, the displacement of the engine mounted or the vehicle structure). As a result, there is a problem that it is difficult to perform standardization that makes it possible to use silencers having the same configuration in different vehicles. Therefore, there is a problem that the cost increases.

  Further, as a structural problem of the silencer, since the internal pipe is fixed by the partition wall, it is easily affected by vibration caused by pulsation. Further, since the shell is made of a plate material, the rigidity is not high. Therefore, there is also a problem that a radiated sound is easily generated when the vibration of the partition wall is transmitted to the shell.

  This invention is made | formed in view of such a problem, and it aims at providing the silencer which can reduce the manufacturing cost of a silencer by standardizing the basic structure of a silencer.

  According to the first aspect of the present invention, there is provided a case comprising a cylindrical body and an end plate that closes an opening of the cylindrical body, a partition plate comprising a vertical plate and a horizontal plate, and a gas that is contained in the case. The partition plate divides the case into two or more chambers, and the chamber is formed by a communication hole provided in the partition plate. At least two of these are communicated with each other.

  According to a second aspect of the present invention, in the silencer according to the first aspect, the vertical plate and the horizontal plate of the partition plate are configured in a lattice shape.

  According to a third aspect of the present invention, in the silencer according to the first or second aspect, the case has a rectangular parallelepiped shape in which opposing sides are formed substantially in parallel, and the height thereof is smaller than the depth and the width. It is characterized by.

  In the invention of claim 4, a communication hole is provided in a partition plate composed of a vertical plate and a horizontal plate, the partition plate is inserted into a cylindrical body, and an end plate is attached to the opening of the cylindrical body to constitute a case. The case is provided with an inlet hole for introducing gas and an outlet hole for discharging gas.

  According to a fifth aspect of the present invention, in the method for manufacturing a silencer according to the fourth aspect, the partition plate is configured such that the vertical plate and the horizontal plate are configured in a lattice shape.

  A sixth aspect of the present invention is the method for manufacturing a silencer according to the fourth or fifth aspect, wherein the case has a rectangular parallelepiped shape in which opposite sides are formed substantially parallel to each other, and the height is greater than the depth and the width. Is also small.

  According to the invention of claim 1, since the gas flow path and the gas silencing structure can be configured by the communication holes provided in the partition plate installed in the case, the basic structure of the silencer can be standardized. Moreover, since the tuning of the silencer structure can be facilitated, the manufacturing cost of the silencer can be reduced. Moreover, the radiated sound of the case can be reduced by the partition plate.

  According to the invention of claim 2, since the vertical plate and the horizontal plate are configured in a lattice shape, the partition plate can standardize the basic structure of the silencer, and facilitate the tuning of the silencer structure. Therefore, the manufacturing cost of the silencer can be reduced. The partition plate can reduce the radiated sound of the case.

  According to the invention of claim 3, the case has a rectangular parallelepiped shape in which opposite sides are formed substantially in parallel, and the height thereof is smaller than the depth and width, so that the space efficiency when the silencer is mounted is increased. .

  According to the invention of claim 4, by providing a communication hole in the partition plate composed of a vertical plate and a horizontal plate, inserting the partition plate into a cylindrical tubular body, and attaching an end plate to the opening of the tubular body. A case is constructed, and an inlet pipe for introducing gas and an outlet pipe for discharging gas are attached to the case, so that the basic structure of the silencer can be standardized, and tuning of the silencer structure is easy Therefore, the manufacturing cost of the silencer can be reduced. Moreover, the radiated sound of the case can be reduced by the partition plate.

  According to the invention of claim 5, since the vertical plate and the horizontal plate are configured in a lattice shape, the partition plate can standardize the basic structure of the silencer, and facilitate the tuning of the silencer structure. Therefore, the manufacturing cost of the silencer can be reduced. The partition plate can reduce the radiated sound of the case.

  According to the invention of claim 6, since the case has a rectangular parallelepiped shape in which opposite sides are formed substantially in parallel, and the height is smaller than the depth and the width, the space efficiency when the silencer is mounted is increased. .

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

  FIG. 1 is an explanatory diagram showing a configuration of a silencer (muffler) 10 according to an embodiment of the present invention, and is a perspective view of the silencer 10.

  The silencer (muffler) 10 includes a case 21, an inlet pipe 22, an outlet pipe 23, and a partition plate 30.

  The case 21 is a box that determines the outer shape of the silencer 10, and has a rectangular parallelepiped shape in which opposing sides are formed substantially in parallel. As shown in FIG. 1, the case 21 is configured such that the size in the height direction is smaller than the depth and the width.

  The case 21 includes a cylindrical cylinder 21a having both ends opened, and an end plate 21b and an end plate 21c that cover openings at both ends of the cylinder 21a. The case 21 is provided with an inlet hole 22a for introducing the exhaust gas on one side and an outlet hole 23a for discharging the exhaust gas to the atmosphere on the other side diagonally opposite the inlet hole 22a. An inlet pipe 22 and an outlet pipe 23 are attached to the inlet hole 22a and the hole 23a, respectively.

  In addition, as shown in FIG. 1, the cylindrical body 21a has an R-shaped corner. It is not always necessary to perform R processing.

  In the case 21, a partition plate 30 having a lattice-like structure is provided. The partition plate 30 is in contact with the inner surface of the case 21 at an end thereof, and constitutes a space surrounded by the case 21 and the partition plate 30. This space constitutes a chamber 31 that divides the inside of the case 21. A communication hole 32 (see FIG. 2) that communicates adjacent chambers 31 with each other is provided at an important point of the partition plate 30.

  As will be described later, the chamber 31 and the communication hole 32 constitute a silencer structure that silences the sound waves of the exhaust gas inside the silencer 10.

  In the embodiment of the present invention, as shown in FIG. 1, an example of the silencer 10 including 4 × 4 = 16 chambers 31 by the partition plate 30 is shown, but the number of the chambers 31 is limited to this. It is not something. For example, the silencer 10 including 2 × 2 = 4 chambers 31 may be used, or the silencer 10 including 5 × 4 = 20 chambers 31 may be used. In order to configure the sound deadening structure, it is sufficient that at least two chambers 31 are provided between the inlet pipe 22 and the outlet pipe 23.

  The case 21, the inlet pipe 22, the outlet pipe 23, and the partition plate 30 are made of stainless steel. Stainless steel is preferably used when silencing relatively high-temperature exhaust gas such as automobile engines. On the other hand, an aluminum alloy, a magnesium alloy, or the like can be used for silencing of a relatively low temperature exhaust gas such as a fuel cell. In this case, the cylindrical body 21a and the partition plate 30 may be integrally formed by extrusion molding.

  When an aluminum alloy or a magnesium alloy is used, the weight can be reduced from about 1/4 to 1/3 compared to stainless steel when the plate thickness is made equal to stainless steel. Further, when the strength is equal to that of stainless steel, it is necessary to slightly increase the plate thickness. Even in this case, the weight can be reduced from about 1/3 to 1/2 as compared with stainless steel.

  FIG. 2 is an explanatory diagram of the partition plate 30.

  As shown in FIG. 2, the partition plate 30 has a lattice-like structure composed of vertical plates 30 a and horizontal plates 30 b, and the horizontal cross section is configured to contact the inner surface of the case 21.

  The partition plate 30 is configured by combining a vertical plate 30a and a horizontal plate 30b with each other. In the example of the embodiment of the present invention, an example in which the interior of the silencer 10 is divided into 16 chambers 31 by three vertical plates 30 a and three horizontal plates 30 b is shown. The vertical plate 30a and the horizontal plate 30b are configured by processing plate materials such as stainless steel into the same shape.

  Both the vertical plate 30a and the horizontal plate 30b are provided with cut portions 35a and 35b at portions where they intersect. By fitting the cut portions 35a and 35b to each other, the vertical plate 30a and the horizontal plate 30b are combined in a lattice shape to form the partition plate 30.

  A communication hole 32 composed of one or a plurality of round holes is provided at a key point of the partition plate 30. The communication hole 32 communicates the adjacent chambers 31 with each other. As a result, the exhaust gas can flow between the adjacent chambers 31.

  The flow rate of the exhaust gas can be adjusted by changing the diameter and number of the communication holes 32. The communication hole 32 is, for example, a round hole having a diameter of φ1 to φ4 in consideration of clogging due to carbon in the exhaust gas. Further, when the exhaust gas flow rate is increased, the communication hole 32 may have a shape in which the partition plate 30 of the part is opened in a rectangular shape instead of a plurality of round holes, or the partition plate 30 of the part is removed. May be.

  In this way, by providing the communication hole 32 in the partition plate 30, an exhaust gas flow path is formed, and an expansion chamber for noise reduction, a resonance chamber, a sound absorbing member storage chamber, a gas flow passage restriction, and noise reduction such as diffusion. Configure the structure. Furthermore, by arbitrarily setting the position and shape of the communication hole 32 of the partition plate 30, it is possible to tune the noise reduction according to the vehicle type.

  In addition, the partition plate 30 may be integrally formed by extrusion molding or the like instead of the combination of the vertical plate 30a and the horizontal plate 30b.

  Next, a method for assembling the silencer 10 according to the embodiment of the present invention will be described.

  First, a cylindrical metal plate is bent to form a cylindrical body 21a having both ends opened.

  Next, the partition plate 30 is inserted into the cylindrical body 21a.

  Prior to insertion into the cylindrical body 21a, the partition plate 30 is a combination of a vertical plate 30a and a horizontal plate 30b provided with communication holes 32 in advance in a lattice shape. In addition, after combining the vertical plate 30a and the horizontal plate 30b, the communication hole 32 may be provided by laser processing or the like.

  When the sound absorbing material is stored in any one of the chambers 31, the sound absorbing material processed in advance according to the shape of the chamber 31 is stored in a portion corresponding to the chamber 31 of the partition plate 30.

  Next, the end plates 21b and 21c are joined to the opening of the cylindrical body 21a, respectively.

  The end plates 21b and 21c are welded after being assembled to the opening of the cylindrical body 21a. Thereby, the cylinder 21a and the end plates 21b and 21c are integrally joined to form the case 21.

  The end plates 21b and 21c may not be joined by welding. For example, they may be mechanically attached by caulking or the like, and if materials are possible, these may be joined by diffusion friction welding (FSW).

  Next, the inlet pipe 22 and the outlet pipe 23 are joined to the case 21.

  First, an inlet hole 22a is provided on one side of the case 21, and an outlet hole 23a is provided at a position diagonally opposite the inlet hole 22a. The inlet pipe 22 and the outlet pipe 23 are joined to the inlet hole 22a and the outlet hole 23a, respectively, by welding or the like. The inlet hole 22a and the outlet hole 23a may be processed before the partition plate 30 is inserted into the cylindrical body 21a.

  The silencer 10 is assembled by the above procedure.

  In addition, although the inlet pipe 22 and the outlet pipe 23 were provided in the side where the case 21 opposes, it is not restricted to this structure. With the layout of the silencer 10 and the tuning of the silencer structure, the inlet pipe 22 and the outlet pipe 23 can be arbitrarily designed from which direction the exhaust gas is introduced and discharged. For example, the inlet pipe 22 and the outlet pipe 23 may be arranged on the same side.

  Further, a groove for fixing the partition plate 30 may be provided on the inner surface of the case 21 so that the partition plate 30 is fixed in the case 21. Moreover, when fixing case 21 and the partition plate 30 still more firmly, you may join by laser welding etc. after an assembly. Moreover, the partition plate 30 may weld beforehand the intersection part of the vertical plate 30a and the horizontal plate 30b.

  Next, a specific example of the silencing structure will be described.

  3 and 4 are top views of the silencer 10 of the present invention, showing an example of a silencer structure.

  In the example shown in FIG. 3, an expansion chamber, a resonance chamber, and a sound absorbing member storage chamber are configured inside the silencer 10. In addition, a throttle structure is provided in the exhaust gas passage.

  Specifically, the chambers 31a, 31b, 31c, 31d, 31h, 31l, and 31p are communicated with each other through the communication hole 32, and this is used as an exhaust gas flow path. Note that the communication hole 32 between the chamber 31b and the chamber 31c and between the chamber 31h and the chamber 31l has a small diameter and a throttle structure with a small opening area.

  In addition, the chambers 31a, 31e, 31i, and 31m are communicated acoustically with a communication hole 32 having a relatively large area that is acoustically identical to the state without a wall, and this is used as one expansion chamber.

  Further, the chambers 31f, 31j, and 31n are communicated with each other through the communication hole 32, and this is used as a resonance chamber. The resonance chamber and the exhaust gas flow path are communicated with each other by a small-diameter communication hole 32 serving as a throttle action provided between the chamber 31b and the chamber 31f.

  Further, the chambers 31g, 31k, and 31o are communicated with each other through the communication hole 32, and the chamber 31 is filled with a sound absorbing member, which is used as a sound absorbing member storage chamber. The sound absorbing member storage chamber and the exhaust gas passage are communicated with each other through a communication hole 32 provided between the chamber 31c and the chamber 31g.

  The muffler 10 configured as described above operates as follows.

  In the chamber 31a, the exhaust gas flowing into the case 21 from the inlet pipe 22 communicates with an expansion chamber composed of the chambers 31e, 31i, and 31m. In the expansion chamber, the cross-sectional area of the exhaust gas passage is enlarged. As a result, the sound wave of the exhaust gas is expanded, so that the sound wave is attenuated.

  Subsequently, the exhaust gas passes through the chamber 31b communicating with the resonance chamber. In the chamber 31b, the exhaust gas flows into the resonance chamber through the small-diameter communication hole 32. In the resonance chamber, sound waves are attenuated by resonating sound waves of a specific frequency of the exhaust gas by Holmhertz principle. This specific frequency is determined by the volume and shape of the resonance chamber.

  Subsequently, the exhaust gas flows into the chamber 31c from the chamber 31b through the small-diameter communication hole 32. This throttle structure temporarily changes the cross-sectional area of the exhaust gas flow path, so that the sound waves of the exhaust gas are attenuated. Although the sound wave is attenuated by providing a large number of throttle structures, the pressure loss of the exhaust gas also increases, and therefore the small diameter communication holes 32 need to be appropriately arranged.

  The chamber 31c communicates with the sound absorbing member storage chamber through the communication hole 32. In the sound-absorbing material storage chamber, high-frequency sound is mainly attenuated among the sound waves of the exhaust gas by the sound-absorbing member. The sound absorbing member is generally made of a fibrous material such as glass fiber. In order to prevent the fibrous material from scattering, the sound absorbing member storage chamber is not provided with a structure serving as an exhaust gas outlet.

  Thereafter, the exhaust gas is discharged from the outlet pipe 23 to the atmosphere via the chambers 31d, 31h, 31l and 31p. When flowing from the chamber 31h into the chamber 31l, the cross-sectional area of the exhaust gas flow path changes, so that the sound waves of the exhaust gas are attenuated.

  With such a silencing structure, the exhaust gas can be silenced and discharged to the atmosphere.

  Next, an example shown in FIG. 4 will be described. In this example, an expansion chamber, a branch chamber, a resonance chamber, and a sound absorbing member storage chamber are configured inside the silencer 10. In addition, a throttle structure is provided in the exhaust gas passage.

  Specifically, the chambers 31a, 31e, 31i, 31j, 31k, 31l and 31p are communicated with each other through the communication hole 32, and this is used as an exhaust gas flow path. The communication hole 32 between the chamber 31j and the chamber 31k has a small diameter and a throttle structure with a small opening area.

  Further, the chambers 31a, 31e and 31i are communicated with each other through the communication hole 32, and this is used as one expansion chamber.

  Further, the chambers 31b, 31c, and 31d are communicated with each other through the communication hole 32 to form a dead-end room, which is a branch chamber. The exhaust gas flow path and the branch chamber communicate with each other through a communication hole 32 provided between the chamber 31a and the chamber 31b.

  Further, the chambers 31o, 31n, and 31m are communicated through the communication hole 32 to be a dead-end room, and this is a resonance chamber. The resonance chamber and the exhaust gas passage are communicated with each other by a small-diameter communication hole 32 provided between the chamber 31p and the chamber 31o.

  Further, the chambers 31f, 31g, and 31h are communicated with each other through the communication hole 32, and the chamber 31 is filled with a sound absorbing member, which is defined as a sound absorbing member storage chamber. The sound absorbing member storage chamber and the exhaust gas passage are communicated with each other through a communication hole 32 provided in the chambers 31j, 31k, and 31l.

  The muffler 10 configured as described above operates as follows.

  In the chamber 31a, the exhaust gas flowing into the case 21 from the inlet pipe 22 flows into the expansion chamber composed of the chambers 31e and 31i, and the sound wave is attenuated.

  A part of the exhaust gas flows into the branch chamber composed of the chambers 31b, 31c and 31d from the communication hole 32 of the chamber 31a. In the branch chamber, the sound wave is reduced by the interference of the exhaust gas by reflecting the sound wave having a frequency corresponding to the depth length.

  Subsequently, the exhaust gas flows from the chamber 31i through the chambers 31j, 31k, 31l to the chamber 31p. In the chamber 31p, the exhaust gas is discharged from the outlet pipe 23 to the atmosphere. The chamber 31j and the chamber 31k have a throttle structure.

  In addition, since the chambers 31j, 31k, and 31l communicate with the chambers 31f, 31h, and 31h that house the sound absorbing material, respectively, the high-frequency components of the sound waves of the exhaust gas are attenuated.

  In the chamber 31p, the exhaust gas flows into the resonance chamber through the small-diameter communication hole 32, and the sound wave of a specific frequency of the exhaust gas is attenuated by the Holmhertz principle.

  With such a silencing structure, the exhaust gas can be silenced and discharged to the atmosphere.

  As described above, the silencer 10 according to the embodiment of the present invention is configured by appropriately setting the position, area, and shape of the communication hole 32 provided in the partition plate 30, so that the sound absorbing chamber, the expansion chamber, the branch chamber, and the resonance chamber. Further, it is possible to construct a silencing structure such as a sound absorbing member storage chamber and arbitrarily design these silencing structures according to the frequency band to be silenced.

  In particular, the silencer 10 according to the embodiment of the present invention has a partition plate 30 that does not have the communication hole 32 and a case 21 prepared in advance, and the communication hole 32 is processed later, so that the silencer structure is provided. Can be configured. That is, the silencer 10 can be standardized by the partition plate 30 not provided with the communication hole 32 and the case 21.

  More specifically, the silencer 10 standardized according to the engine displacement is prepared in advance, and the number and shape of the communication holes 32 and the positions of the inlet pipe 22 and the outlet pipe 23 are determined in correspondence with each vehicle. By appropriately designing, the sound deadening performance can be finely tuned.

  Thereby, compared with the method of designing the silencer 10 for each vehicle individually and manufacturing the silencer 10 for each vehicle as in the past, the design man-hours and manufacturing man-hours can be reduced, thereby reducing the cost. Can do. For the same reason, the trial production cost of the silencer 10 can be reduced. Further, by standardizing the basic configuration of the silencer 10, a mass production effect is exhibited, and the cost can be further reduced.

  Further, the standardized silencer structure of the silencer 10 can be finely tuned according to the characteristics of the vehicle by the configuration of the communication hole 32, the position port pipe 22 and the outlet pipe 23, etc. Can be designed optimally. Thereby, since airflow sound and pressure loss can be reduced, the silencing efficiency is improved as compared with a conventional silencer having the same capacity.

  Further, by appropriately setting the shape of the partition plate 30 and the position and shape of the communication hole 32, various sound deadening structures such as a double branch structure, a two-stage expansion structure, a resonator structure, and a sound absorbing material filled type branch structure are formed. It becomes possible.

  Moreover, the inside of the silencer 10 is only the plate-like partition plate 30, and the weight can be reduced as compared with a conventional silencer in which a pipe or the like is combined.

  The case 21 has a rectangular parallelepiped shape, and is configured to have a small thickness in the direction perpendicular to the gas flow direction. In recent years, the space for installing the silencer 10 has been limited due to the expansion of the cabin space and the increase in auxiliary equipment. By making the silencer 10 thin, the degree of freedom of installation under the floor of the vehicle is increased without being restricted by the minimum ground clearance, and space efficiency can be improved. In the embodiment of the present invention, the case 21 has a rectangular parallelepiped shape. However, the case 21 is not limited to this, and may be circular, elliptical, irregular, or ultra flat. In this case, it goes without saying that the partition plate 30 has a shape that matches the cylindrical shape of the cylindrical shape of the case 21.

  In addition, since a grid-like partition plate 30 is housed inside the rectangular parallelepiped case 21, and this abuts against the case 21 from the inner surface, the rigidity of the silencer 10 can be improved, and the generation level of radiated sound can be reduced. .

  In the silencer 10 according to the embodiment of the present invention, the case 21 has a substantially rectangular parallelepiped shape in which the facing sides are substantially parallel, and thus the outer surface thereof is a flat surface (flat structure). In general, when there are many flat portions, sound waves are radiated from the surface. However, since the grid-like partition plate 30 comes into contact with the inside of the case 21, the case 21 is difficult to vibrate, and generation of radiated sound is suppressed. In order to further improve the sound performance, bead processing may be performed around the opening where the end plates 21b and 21c are attached to suppress the radiated sound. Further, the outer surface of the case 21 may be processed into a corrugated plate shape. Similarly, the partition plate 30 may be a corrugated plate instead of a flat structure.

  In addition, condensed water caused by exhaust gas may stay in the silencer 10. On the other hand, condensate is collected in a room near the outlet by providing a gap and a small hole in the lower part of the partition plate 30 and the inner surface of the case 21 and inclining the entire silencer. A pitot tube may be installed in the interior, and suction may be performed by the low pressure generated by the exhaust gas flow passing through the outlet pipe 23, and the gas may be discharged from the outlet pipe 23. Further, a small hole may be arbitrarily opened at the lower end of the case 21, and the condensed water may be drained by the pressure of the exhaust gas. Thereby, corrosion of the silencer 10 by condensed water can be prevented.

  In the embodiment of the present invention, the noise reduction of exhaust gas from an internal combustion engine and a fuel cell mounted on a vehicle has been described. However, the present invention is not limited to this, and exhaust gas and a compressor in a factory plant or home are used. It can also be used to silence pulsations from

It is explanatory drawing which shows the structure of the silencer of embodiment of this invention. It is explanatory drawing of the partition plate of embodiment of this invention. It is an example of the silence structure of embodiment of this invention. It is another example of the silencing structure of the embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Silencer 21 Case 21a Cylindrical body 21b, 21c End plate 22a Inlet hole 22 Inlet pipe 23a Outlet hole 23 Outlet pipe 30 Partition plate 30a Vertical plate 30b Horizontal plate 31 Chamber 32 Communication hole

Claims (6)

A case (21) comprising a cylindrical body (21a) and an end plate (21b, 21c) for closing the opening of the cylindrical body (21a);
A partition plate (30) comprising a vertical plate (30a) and a horizontal plate (30b), which is installed in the case (21);
An inlet hole (22a) for introducing gas into the case (21);
An outlet hole (23a) for discharging gas from the case (21),
The partition plate (30) divides the case into two or more chambers (31), and at least two of the chambers (31) are mutually connected by a communication hole (32) provided in the partition plate (30). A muffler characterized by communication. The silencer according to claim 1,
The partition plate (30) is a silencer, wherein the vertical plate (30a) and the horizontal plate (30b) are configured in a lattice shape. The muffler according to claim 1 or 2,
The case (21) has a rectangular parallelepiped shape in which opposing sides are formed substantially in parallel, and a height thereof is smaller than a depth and a width. A communication hole (32) is provided in the partition plate (30) composed of the vertical plate (30a) and the horizontal plate (30b),
Insert the partition plate (30) into the cylinder (21a),
A case (21) is constructed by attaching end plates (21b, 21c) to the opening of the cylindrical body (21a),
A method of manufacturing a silencer, wherein the case (21) is provided with an inlet hole (22a) for introducing gas and an outlet hole (23a) for discharging gas. In the manufacturing method of the silencer according to claim 4,
The partition plate (30) is a silencer, wherein the vertical plate (30a) and the horizontal plate (30b) are configured in a lattice shape. In the manufacturing method of the silencer according to claim 4 or 5,
The case (21) has a rectangular parallelepiped shape in which opposite sides are formed substantially in parallel, and the height thereof is smaller than the depth and the width.

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