Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N1/00—Silencing apparatus characterised by method of silencing
  • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
  • F01N1/04—Silencing apparatus characterised by method of silencing by using resonance having sound-absorbing materials in resonance chambers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N1/00—Silencing apparatus characterised by method of silencing
  • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
  • F01N1/083—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using transversal baffles defining a tortuous path for the exhaust gases or successively throttling exhaust gas flow
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N1/00—Silencing apparatus characterised by method of silencing
  • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
  • F01N1/085—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling throttling exhaust gas flow using a central core in a flow passage
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N1/00—Silencing apparatus characterised by method of silencing
  • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
  • F01N1/086—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling having means to impart a whirling motion to the exhaust gases
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N1/00—Silencing apparatus characterised by method of silencing
  • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
  • F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M8/00—Fuel cells; Manufacture thereof
  • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M8/00—Fuel cells; Manufacture thereof
  • H01M8/06—Combination of fuel cells with means for production of reactants or for treatment of residues
  • H01M8/0662—Treatment of gaseous reactants or gaseous residues, e.g. cleaning
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
  • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
  • F01N2240/32—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a fuel cell
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N2470/00—Structure or shape of exhaust gas passages, pipes or tubes
  • F01N2470/02—Tubes being perforated
  • F01N2470/04—Tubes being perforated characterised by shape, disposition or dimensions of apertures
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N2470/00—Structure or shape of exhaust gas passages, pipes or tubes
  • F01N2470/20—Dimensional characteristics of tubes, e.g. length, diameter
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N2510/00—Surface coverings
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/30—Hydrogen technology
  • Y02E60/50—Fuel cells

Definitions

• the fuel gas supplied to the anode electrode and the oxidizing gas supplied to the force sword electrode undergo a power generation reaction at the electrolyte membrane, and at the same time, moisture is generated.
• the generated moisture is discharged from a predetermined exhaust system joined to the fuel cell as exhaust gas of the fuel cell together with the fuel gas and oxidizing gas not used in the reaction.
• a relatively high frequency air flow noise 500 to 200 Hz may be generated.
• the exhaust system of fuel cell vehicles and the like is often equipped with a sound absorbing type silencer filled with a sound absorbing material such as glass wool (silencer).
• the silencer 1 0 0 has an inner pipe 1 0 2 through which exhaust from the fuel cell flows, and a surrounding shell 1 0 4 surrounding the inner pipe 1 0 2. Between 0 and 4, sound absorbing material such as glass wool 10 6 is filled.
• the inner pipe 10 2 is formed with a plurality of sound transmission holes 10 8 on its peripheral wall. The sound radiated from the sound transmission hole 10 8 toward the sound absorbing material 1 06 is repeatedly scattered and interfered by the sound absorbing material 1 06 and attenuated during this time, so that it is absorbed by the sound absorbing material 1 06.
• the exhaust gas of a fuel cell contains a lot of water produced by the reaction of hydrogen and oxygen.
• This moisture is condensed upstream of the exhaust system and becomes water and flows into the silencer, or the moisture condenses inside the silencer, so that the moisture is condensed in the vertical lower part of the silencer (hereinafter referred to as the bottom).
• Water may accumulate.
• the sound-absorbing material filled in the bottom of the silencer absorbs and holds water (hereinafter referred to as water content), thereby achieving a predetermined sound absorption capacity. May not be able to be used, and the noise reduction performance may be reduced.
• a silencer 1 2 0 is proposed in Japanese Patent Application Laid-Open No. 20 0 2-2 0 6 4 1 3.
• the silencer 1 2 0 is partitioned vertically by a partition plate 1 2 4 having a communication hole 1 2 3 so that the interior of the silencer 1 2 0 is vertically divided into a sound absorption chamber 1 2 6 and An expansion chamber 1 2 8 is formed.
• an inner pipe 1 30 having a sound transmission hole 1 3 6 is disposed, and a sound absorbing material is filled so as to surround the inner pipe 1 30.
• a silencer for a fuel cell according to the present invention has a plurality of sound transmission holes formed in a peripheral wall, and is disposed so as to surround an inner pipe through which exhaust gas flows, and the inner pipe with a predetermined interval from the peripheral wall.
• the sound transmitting hole is configured so that a liquid film is not formed in the hole. Further, the shape of the sound transmission hole can be interpreted as having a function of reducing the surface tension of the liquid in the hole.
• the silencer for a fuel cell according to the present invention has the following characteristics.
• the silencer for a fuel cell according to the present invention has a plurality of sound transmission holes formed in the peripheral wall, And an inner pipe that is disposed so as to surround the inner pipe at a predetermined interval from the peripheral wall, and is filled with a sound absorbing material between the inner pipe and constitutes a sound absorbing chamber.
• the hole has an inner diameter of 3 mm or more and a depth of 1.2 mm or less.
• the peripheral edge portion of the sound transmission hole in the inner pipe is formed to be thinner than other portions.
• ribs that reinforce the inner pipe are formed between the sound transmission holes.
• a silencer for a fuel cell according to the present invention has a plurality of sound transmission holes formed in a peripheral wall, and is arranged to surround an inner pipe through which exhaust flows and an inner pipe at a predetermined interval from the peripheral wall.
• a sound absorbing chamber that is filled with a sound absorbing material to form a sound absorbing chamber, and the sound transmitting hole is formed in an oval shape having a long axis along the axial direction of the inner pipe It is characterized by that.
• a silencer for a fuel cell according to the present invention has a plurality of sound transmission holes formed in a peripheral wall, and is arranged to surround an inner pipe through which exhaust flows and an inner pipe at a predetermined interval from the peripheral wall.
• a sound absorbing material is provided between the two and a hollow shell constituting a sound absorbing chamber, and a groove hole for connecting adjacent sound transmitting holes is formed.
• a silencer for a fuel cell according to the present invention has a plurality of sound transmission holes formed in a peripheral wall, and is arranged to surround an inner pipe through which exhaust flows and an inner pipe at a predetermined interval from the peripheral wall. And an outer shell that constitutes a sound absorption chamber, and the inner wall of the sound transmission hole is formed in a sawtooth shape.
• a silencer for a fuel cell according to the present invention has a plurality of sound transmission holes formed in a peripheral wall, and is disposed so as to surround an inch pipe through which exhaust flows and an inner pipe at a predetermined interval from the peripheral wall.
• a sound absorbing chamber is formed between the two and the sound absorbing chamber, and a water repellent film is formed on the inner wall of the sound transmitting hole.
• the silencer for a fuel cell according to the present invention has a plurality of sound transmission holes formed in the peripheral wall, And an inner pipe that is disposed so as to surround the inner pipe at a predetermined interval from the peripheral wall, and is filled with a sound absorbing material between the inner pipe and constitutes a sound absorbing chamber. A sound absorbing material is filled inside the inner wall of the hole.
• a silencer for a fuel cell according to the present invention has a plurality of sound transmission holes formed in a peripheral wall, and is disposed so as to surround the inner pipe through which exhaust flows, and the inner pipe at a predetermined interval from the peripheral wall.
• a drift member that biases the flow of the exhaust so that the exhaust flow does not directly hit the sound transmission hole in the inner pipe. are provided.
• the drift member is a ruler that protrudes from the immediately upstream side of the sound transmission hole in the inner wall of the inner pipe so as to incline in the downstream direction.
• the drift member may be provided on the inner wall of the upstream end portion of the inner pipe, and is preferably a flow guide plate that guides exhaust gas to a region where no sound transmission hole is formed.
• the silencer for a fuel cell according to the present invention is characterized in that a swirling flow generating member for generating a swirling flow along the inner wall of the inner pipe is provided at an upstream end of the inner pipe.
• a silencer for a fuel cell according to the present invention has a plurality of sound transmission holes formed in a peripheral wall, and is disposed so as to surround the inner pipe through which exhaust flows, and the inner pipe at a predetermined interval from the peripheral wall.
• the inner pipe is provided with a vortex generating member for generating a vortex in the vicinity of the inner wall of the inner pipe.
• a silencer for a fuel cell according to the present invention comprises a flow guiding means for causing a part of exhaust gas flowing into an inner pipe to flow out of the inner pipe into a sound absorbing chamber via an upstream sound transmission hole. The exhaust gas flowing out into the chamber flows again into the inner pipe through the downstream sound transmission hole.
• the flow guiding means is preferably a throttle formed in the middle of the inner pipe.
• the silencer for a fuel cell according to the present invention has a plurality of sound transmission holes formed in the peripheral wall, and surrounds the inner pipe through which the exhaust gas flows and the inner pipe with a predetermined distance from the peripheral wall.
• a sound-absorbing shell that is filled with a sound-absorbing material and constitutes a sound-absorbing chamber, and the sound-transmitting hole and the peripheral part of the sound-transmitting hole are directed toward the inner pipe axis. It is characterized by projecting.
• a fuel cell silencer comprises an inner casing through which exhaust gas flows, a plurality of through holes formed in a wall surface, and a sound absorbing chamber that is filled with a sound absorbing material.
• the inner case is arranged over the entire cross section of the flow path of the air shell so that all of the exhaust flowing through the air shell flows through the inner case.
• a fuel cell silencer includes a shell through which exhaust gas flows, a plate-like member in which the inside of the shell is partitioned by a plane perpendicular to the flow direction of the exhaust, and a plurality of through holes are formed. It is characterized by having.
• FIG. 1 is a longitudinal sectional view of the silencer of the first embodiment.
• FIG. 3 is an enlarged cross-sectional view of the inner pipe peripheral wall in the silencer of the modification of the first embodiment, and is an enlarged cross-sectional view surrounded by a two-dot chain line A in FIG.
• FIG. 4 is a longitudinal sectional view of a silencer of another modification of the first embodiment.
• FIG. 5 is a view of the inner pipe whose cross section is shown in FIG. 4 as viewed from the direction indicated by the arrow D.
• FIG. 6 is a view showing the shape of a sound transmission hole in the silencer of the second embodiment.
• FIG. 7 is a diagram showing the shape of a sound transmission hole in a silencer of a modification of the second embodiment.
• FIG. 8 is a diagram showing the shape of a sound transmission hole in a silencer of another modification of the second embodiment. No.
• FIG. 9 is an enlarged sectional view of the inner pipe peripheral wall in the silencer of the third embodiment.
• FIG. 15 is a diagram schematically showing a longitudinal section of the silencer of the sixth embodiment.
• FIG. 16 is a diagram schematically showing a longitudinal section of the silencer of the seventh embodiment.
• Fig. 18 is a cross-sectional view of the inner pipe in the silencer of a modification of the seventh embodiment o
• FIG. 19 is a view t of the inner pipe whose cross section is shown in FIG.
• FIG. 21 is a longitudinal sectional view of an inner pipe in a silencer according to a modification of the eighth embodiment.
• FIG. 22 is a view of the inner pipe whose cross section is shown in FIG. 21 as viewed from the direction indicated by the arrow D.
• FIG. 23 is a diagram schematically showing the silencer of the ninth embodiment and its peripheral devices.
• FIG. 24 is a longitudinal sectional view of the silencer of the tenth embodiment.
• FIG. 25 is a view of the inner pipe whose cross section is shown in FIG.
• FIG. 26 is a diagram schematically showing a longitudinal section of the silencer of the first embodiment.
• FIG. 27 is a perspective view of the inner case in the silencer of the first embodiment.
• FIG. 28 is a longitudinal sectional view of the silencer of the first and second embodiments.
• FIG. 29 is a view of the plate-like member in the silencer of the first and second embodiments as seen from the direction indicated by arrow D in FIG.
• FIG. 30 is a diagram showing an example of a schematic configuration of the fuel cell system.
• FIG. 32 is a vertical cross-sectional view of a silencer described in Japanese Patent Publication No. 2000-2010-2103.
• the fuel cell system 80 includes a fuel tank 8 2, a hydrogen tank 8 4 that supplies hydrogen gas to the fuel cell 8 2, a blower 8 6 that supplies oxidant gas to the fuel cell 8 2, and exhaust from the fuel cell 8 2 It has an exhaust system 8 8 (indicated by a two-dot chain line in FIG. 30).
• the hydrogen gas tank 8 4 is joined to the fuel cell 8 2 through the fuel gas supply channel 85, and the hydrogen gas (fuel gas) stored in the hydrogen tank 84 is flown at 90 ° Regigure. And is supplied to the fuel cell 8 2 through the control valve 92.
• the blower 86 is joined to the fuel cell 82 via the oxidizing gas supply path 87, and oxidizing gas (air) is supplied to the fuel cell 82.
• the supplied hydrogen gas and air react to generate electric energy, and at the same time, moisture is generated. From the fuel cell 82, air that has not been used for the reaction or fuel cell Generated by Exhaust gas containing moisture (water vapor) is discharged from a predetermined exhaust system.
• the silencer 10 is provided at the end of the exhaust system. Exhaust containing moisture and water condensed in the exhaust system upstream of the silencer 10 are located upstream of the exhaust system. It flows into the silencer 10 (from the side indicated by arrow D in Fig. 1).
• the silencer 10 includes a water shell 12 that forms the exterior of the silencer, and an inner pipe 14 that is disposed in the air seal 12 and through which exhaust gas flows.
• a sound absorbing chamber 1 7 is formed between the inner pipe 14 and the air shell 1 2 by being filled with a sound absorbing material 16.
• the exhaust gas flowing into the silencer from the upstream side of the exhaust system flows through the inner pipe 14 and is discharged outside the silencer 10.
• the sound transmitted to the inner pipe 14 from the upstream side of the exhaust system together with the exhaust is radiated from the sound transmission holes 18 provided in the peripheral wall 13 of the inner pipe 14 toward the sound absorbing material 16 and absorbed. .
• the silencer 10 exhibits a predetermined silencing performance.
• the inner pipe 14 is externally formed with a plurality of sound transmission holes 18 in the peripheral wall 13 as shown in FIG.
• the pipe part 20 and the inner pipe part 2 2 which is attached to the inside of the peripheral wall 13 of the outer pipe part 20 and reinforces the outer pipe part 20 are constituted.
• the outer tube portion 20 is made of synthetic resin, and the thickness (indicated by dimension B in FIG. 2) is formed to be 1.2 mm or less.
• a large number of sound holes 18 are formed, and the inner diameter (indicated by dimension C in FIG. 2) of the sound transmission holes 18 is set to 3 mm or more.
• the thickness of the inner tube portion 22 is formed to be thicker than that of the outer tube portion 20.
• a plurality of through holes 23 are formed in the pipe portion 2 2 corresponding to the sound transmission holes 18 described above. The shape of the through hole is formed so as not to block the sound transmission hole 18 formed in the outer tube portion 20 when the inner tube portion 22 is attached to the outer tube portion 20.
• the relatively thin-walled inner tube portion 2 2 is inserted into the outer tube portion 20 and welded to reinforce the thin-walled outer tube portion 20.
• the inner pipe 14 is made of a synthetic resin, and the desired rigidity is ensured.
• the inner wall of the inner pipe 14 has an inner diameter of 3 mm or more and a depth of 1.2 mm or less.
• the sound transmission holes 18 can be formed.
• the “depth” as used herein refers to the length of the sound transmission hole 18 in the direction along the central axis of the sound transmission hole 18 indicated by a dashed line E in FIG. It is the thickness of the portion to be formed (in this embodiment, the outer tube portion 20).
• the sound transmission hole 18 is set to a sufficiently small depth of 1.2 mm or less while the inner diameter is 3 mm or more. Since the area of the inner wall of the sound transmission hole 18 holding the water film stretched according to the inner diameter is small, the inner wall of the sound transmission hole 18 cannot hold the water film. Therefore, in the silencer 10 of the present embodiment, even if water flowing in from the upstream of the exhaust system or water condensed in the silencer adheres to the sound transmission hole, a water film is prevented from stretching in the sound transmission hole. can do.
• the silencer 10 of the present embodiment when realizing a synthetic resin inner pipe having a sound transmission hole 18 having an inner diameter of 3 mm or more and a depth of 1.2 mm or less, the sound transmission hole 18 is formed.
• the inner pipe portion 2 2 that reinforces the outer pipe portion 20 is inserted inside the thin outer pipe portion 20 to be formed, but the structure of the inner pipe is not limited to this. . It can also be realized by various aspects described below. For example, as in the modification shown in FIG. 3, it is also preferable that the peripheral edge portion 24 of the sound transmission hole 18 in the inner pipe 14 b is formed thinner than the other portion 25. is there.
• the peripheral edge portion 24 is a portion adjacent to the inner wall of the sound transmission hole 18, and the portion closer to the inner wall of the sound transmission hole 18 is formed to be thinner.
• the inner wall of the sound transmission hole 18 is formed so that its thickness (indicated by dimension B) is 1.2 mm or less.
• the peripheral edge 24 can be formed by cutting or injection molding.
• the “other part” located farther away from the sound transmission hole 1 8 compared to the peripheral edge 2 4 is formed to have a sufficient thickness as compared with the portion where the sound transmission hole 18 is formed.
• the sound transmission hole 18 By forming the peripheral edge portion 24 of the sound transmission hole 18 thinner than the other portion 25, the sound transmission hole having the above-described dimensions that does not stretch the water film while ensuring the rigidity of the inner pipe.
• the sound transmission hole can be realized as an inner pipe made of synthetic resin.
• ribs 28 for reinforcing the inner pipe 14 c are formed between the sound transmission holes 18 as in other modifications shown in FIGS.
• the inner pipe 14 c is formed with a rib 28 that protrudes from the inner wall 15 toward the axial center (indicated by F in the figure) of the inner pipe 14 c.
• the rib 28 is formed integrally with the inner pipe 14, and the inner wall of the inner pipe 14 has an axial rib 28 a extending in the direction along the axis of the inner pipe 14.
• Circumferential ribs 28 b extending circumferentially in a direction perpendicular to the axis of the inner pipe 14 are formed. These ribs 28 are formed between the sound transmission holes 18 so as to avoid the sound transmission holes 18 formed in the inner pipe 14.
• the inner pipe 14 is formed so as to have a thickness of 1.2 mm or less except for a portion where the ribs 28 are formed, and the sound transmission holes 18 are formed therein. Yes.
• the silencer 1 Ob according to the present embodiment will be described with reference to FIG. Fig. 6 shows the shape of the sound transmission hole in the silencer shown in Fig. 1, Fig. 7 shows the shape of the sound transmission hole in the silencer of the modified example, and Fig. 8 shows the silencer of the other modified example.
• the shape of the sound transmission hole in the vessel is shown.
• the silencer 1 Ob of this embodiment differs from the silencer 10 of the first embodiment in the shape of the sound transmission hole formed in the inner pipe, and will be described in detail below.
• symbol is attached
• the sound transmission hole 18 b is formed in an oval shape as indicated by a solid line in FIG.
• This ellipse is shaped like a two-dot chain line in Fig. It has an envelope shape of a circle group generated by sliding it (indicated by arrow G). That is, the shape of the sound transmission hole 18 b is an oval shape having a long axis in the direction indicated by the arrow G.
• the inner wall extends from the central axis of the sound transmission hole 1 8 b indicated by point E in the long axis direction indicated by the arrow G (longitudinal direction of the sound transmission hole 1 8). The distance to 1 9 b is getting longer.
• the sound transmission hole 18 b is set so that the major axis of the oval shape is parallel to the axis F of the inner pipe 14. That is, the sound transmission hole 18 b is set so that the flow direction of the exhaust gas flowing through the inner pipe 14 matches the direction in which the major axis of the sound transmission hole 18 b is set.
• the silencer 10 b of the present embodiment can suppress the formation of a water film in the sound transmission hole.
• the sound transmission hole is formed in an elliptical shape having a long axis along the axial direction of the inner pipe 14 in order to suppress the water film from stretching in the sound transmission hole.
• the shape of the sound transmission hole is not limited to this.
• the inner wall 19 c of the sound transmission hole 18 c is formed in a sawtooth shape.
• sawtooth means a shape in which substantially triangular notches with the part 31 as the apex are continuously formed as compared to the circular sound transmission hole indicated by a two-dot chain line in FIG. Yes. That is, on the inner wall 19 c of the sound transmission hole, the part 30 and the far part 31 that are close to the central axis of the sound transmission hole 18 c indicated by the point E are alternately provided.
• the sound transmission hole inner wall 1 9 .C The water film cannot be held at the part 3 1 where the distance from the center E of the hole 1 8 c is far. Even if a water film is stretched on the sound transmission hole 1 8 c, the part 3 far from the center E Between 1 and 2, the water film is easily broken, and it is possible to suppress the water film from being stretched on the sound transmission hole.
• a groove 32 for connecting adjacent sound transmission samples 18 d and 18 e is formed. Between the circular sound-transmitting hole 18 d and the sound-transmitting hole 18 e, a linear groove hole 32 that connects them at the shortest distance is provided.
• the groove hole 32 is a communication path that connects the sound transmission hole 18 d and the sound transmission hole 18 e.
• the silencer 10 c of this embodiment will be described with reference to FIG. Fig. 9 shows an enlarged cross-sectional view of the inner pipe peripheral wall surrounded by the two-dot chain line A in Fig. 1.
• the silencer 10 c of this embodiment is different from the silencer 10 of the first embodiment in that the sound transmission holes are subjected to water repellent treatment, and will be described in detail below. Note that the same components as those of the silencer 10 of the first embodiment are denoted by the same reference numerals and description thereof is omitted.
• a water repellent layer 34 is formed on the inner wall 19 d of the sound transmission hole 18.
• a water repellent film such as fluorine resin is formed on the inner wall 19d.
• the water repellent layer 34 may be formed not only on the inner wall 19 d of the sound transmission hole but also on the entire inner pipe 14 d. By applying it to the entire inner pipe 14 d, the process required for water repellent treatment can be simplified.
• the water repellent treatment described above is applied, and the water repellent layer 3 4 is formed on at least the inner wall 19 d of the sound transmission holes 1 8, so that the inner wall 19 d of the sound transmission holes 1 8 holds a water film. It becomes impossible to do.
• the silencer 10 c according to the present embodiment can form a water film on the sound transmission hole even when water flowing in from the upstream of the exhaust system or water condensed in the silencer adheres to the sound transmission hole. Can be suppressed.
• FIG. 10 shows an enlarged cross-sectional view of the inner pipe peripheral wall 13 surrounded by a two-dot chain line A in FIG.
• the silencer 10 d of this embodiment is different from the silencer 10 of the first embodiment in that the sound absorbing material is filled inside the inner wall of the sound transmission hole, and the details will be described below.
• symbol is attached
• the inside of the inner wall 19 of the sound transmission hole 18 is filled with a sound absorbing material 16b as shown in FIG.
• the sound absorbing material 1 6 b has a short protruding portion 3 6 formed into a body by press molding or the like.
• the protruding portion 3 6 of 1 6 b fits inside the inner wall 19 of the sound transmission hole 18 formed in the inner pipe 14 e.
• the shape of the protruding portion 36 is set according to the shape of the sound transmission hole 18. As described above, the sound absorbing material 16 b is filled inside the sound transmitting hole 18.
• the silencer 10 d of the present embodiment when water flowing in from the upstream of the exhaust system or water condensed in the silencer 10 d adheres to the sound transmission hole 18, naturally, the sound transmission It also adheres to the protruding portion 3 6 of the sound absorbing material 16 b inside the hole 18.
• the water adhering to the protruding portion 36 is diffused to portions other than the protruding portion 36 of the sound absorbing material 16 b by capillary action. Therefore, the protruding portion 3 6 of the sound absorbing material 16 b does not continue to be immersed in water.
• Fig. 11 shows a cross-sectional view of the inner pipe
• Fig. 12 shows an enlarged cross-sectional view of the inner pipe surrounding wall surrounded by a two-dot chain line I in Fig. 11, and
• Fig. 13 shows a cross-section of Fig. 11
• a view of the inner pipe showing the cross section from the direction indicated by arrow D is shown.
• Fig. 14 shows a cross-sectional view of the inner pipe in the silencer of the modification.
• the silencer 10e of the present embodiment differs from the silencer 10 of the first embodiment in that the inner pipe is provided with a drift member that biases the flow of exhaust gas, and will be described in detail below.
• the exhaust pipe is not directly applied to the sound transmission holes 18 in the inner pipe 14.
• a drift member for biasing the flow of exhaust gas is provided.
• the drift member is provided in the inner pipe 14, so that the moisture contained in the exhaust flow is prevented from flowing directly into the sound transmission hole 1 8 by preventing the exhaust flow containing moisture from directly hitting the sound transmission hole 1 8. Adhering to 8 is suppressed as much as possible.
• a drift member is provided in the inner pipe 14 so that the exhaust flow does not hit the sound transmission hole 18, so that a water film is stretched on the sound transmission hole 18. Can be suppressed.
• a rubber bar 38 protrudes from the inner wall 15 of the inner pipe immediately upstream of the sound transmission hole 18.
• the louver 3 8 is inclined from the upstream side of the sound transmission hole 1 8 toward the inner pipe axis F and in the downstream direction (direction indicated by arrow D). Protruding.
• the exhaust flow flowing along the inner pipe inner wall 15 is biased to the side having the inner pipe axis F by the louver 3 8 immediately upstream of the sound transmission hole 18. . Therefore, the sound transmission hole 18 immediately downstream of the louver 38 is not directly exposed to the exhaust flow flowing through the inner pipe 14 f, and moisture contained in the exhaust is less likely to adhere.
• the rubber bar 38 is preferably provided in an annular shape so as to be continuous over the entire circumference of the inner pipe inner wall 15 as shown in FIG. In this way the resulting louver 3 8 not only biases the exhaust flow in the inner pipe 14 f, but also functions as a “rib” that reinforces the inner pipe 14 f. By reinforcing the inner pipe 1 4 f with this rubber 3 8, it becomes possible to improve the rigidity of the inner pipe 1 4 f. As a result, the peripheral wall 1 3 of the inner pipe 1 4 f is thinner. The thickness can be set.
• a projecting member from the upstream side of the sound transmission hole 18 is used as a drift member that biases the exhaust flow so that the exhaust flow does not directly hit the sound transmission hole 18.
• the drift member is not limited to this.
• the inner pipe 14 g it is also preferable to provide the inner pipe 14 g with a flow guide plate 40 that guides the exhaust flow to the region 39 where the sound transmission hole 18 is not formed.
• the flow guide plate 40 is a plate-like member provided on the inner wall 15 of the upstream end 41 of the inner pipe 14 g.
• the flow direction of the exhaust gas flowing into the inner pipe 14 g (indicated by the arrow D) In contrast, it is inclined.
• the exhaust flow that has flowed into the upstream end 41 of the inner pipe 14 g is deflected by the flow guide plate 40 as shown by the arrow K in FIG. 14, and the sound transmission hole 18 is not formed. Guided to region 3 9 (region surrounded by the alternate long and short dash line in the figure).
• the region 39 where the sound transmission hole 18 is not formed is a region downstream of the upstream side end 41 of the inner pipe 14 g and the sound transmission hole 18 is formed. 4 This means the area excluding 3 (enclosed by a two-dot chain line in the figure).
• the flow guide plate 40 biases the exhaust flow flowing into the inner pipe 14 g so that the exhaust flow avoids the “region 4 3 where the sound transmission holes 18 are formed”.
• the louver 3 8 protruding from the upstream side of the sound transmission hole 18 and the upstream end 4 1 in the inner pipe 14 g.
• the silencer 10 f of this embodiment will be described with reference to FIG. Figure 15 schematically shows a longitudinal section of the silencer.
• the silencer 10 f of this embodiment differs from the silencer 10 of the first embodiment in that a swirl flow generating member that generates a swirl flow along the inner wall of the inner pipe is provided. Will be explained.
• symbol is attached
• the swirl flow generating member 44 is a plate-like member having a twisted shape, as shown in FIG. 15, and is provided at the upstream end 41 in the inner pipe 14 h. Yes.
• This twisted plate-like member generates a swirling flow swirling along the inner pipe inner wall 15.
• the exhaust flow that has flowed into the upstream end 41 of the inner pipe 14 h is swirled around the inner pipe axis F by the plate-like member.
• the swirling exhaust flow (swirl flow) flows in the downstream direction while swirling along the inner pipe inner wall 15 as indicated by an arrow L in the figure. Centrifugal force acting toward the inner pipe wall 15 around the axis of the inner pipe 14 h acts on the exhaust gas turning inside the inner pipe 14 h.
• the silencer 10 of the present embodiment can suppress the formation of a water film in the sound transmission hole:
• the sound transmission hole 18 f is formed in a shape along the flow of the generated swirling flow as shown in FIG. That is, the sound transmission hole 18 is set so that the flow direction of the swirl flow '(indicated by the arrow L) matches the longitudinal direction of the sound transmission hole 18 f.
• the silencer 10 g of the present embodiment will be described with reference to FIGS. Figure 1 Fig. 6 schematically shows a longitudinal section of the silencer, and Fig. 17 shows an example of a vortex generating member provided in the silencer.
• Fig. 18 shows a cross-sectional view of the inner pipe in the silencer of the modified example, and Fig. 19 shows a view of the inner pipe shown in Fig. 18 viewed from the direction indicated by arrow D. Show.
• the silencer 10 g of the present embodiment is different from the silencer 10 of the first embodiment in that a vortex generating member for generating a vortex along the inner wall of the inner pipe is provided. .
• the same components as those of the silencer 10 of the first embodiment are denoted by the same reference numerals and description thereof is omitted.
• the inner pipe 14 i is provided with a vortex generating member that generates a vortex in the vicinity of the inner wall 15 of the inner pipe 14 i.
• the vortex generating member generates the vortex 48 on the upstream side of the sound transmission hole 18.
• the generated vortex 48 flows downstream along the inner wall 15 of the inner pipe 14 and reaches the sound transmission hole 18. Due to the turbulent flow of the vortex 4 8 reaching the sound transmission hole 1 8, it is difficult for a water film to be applied to the sound transmission hole 1 8, and even if a water film is applied to the sound transmission hole 1 8, The water film can be broken by hitting the water flow.
• a water film is stretched in the sound transmission hole by providing a vortex generating member in the inner pipe 14 i to generate a vortex in the vicinity of the inner pipe inner wall 15. It can be suppressed.
• a Karman vortex generating member 46 is provided at the upstream end portion 41 of the inner pipe 14 i as a vortex generating member.
• the Karman vortex generating member 4 6 can be formed of a plate-like member having a thickness as shown in FIG. 17 for example.
• the inner pipe 1 4 i has an axial center F of the inner pipe 1 4 i. It is arranged to pass through.
• the exhaust flow that has flowed into the inner pipe 14 i from the direction indicated by the arrow D is split into two upper and lower flows (indicated by arrows M 1 and M 2 in the figure) by the Karman vortex generating member 46. These two flows are separated at the downstream end 46 e of the Karman vortex generating member 46 and alternately generate vortices 48.
• This Karman vortex 48 flows downstream and reaches the sound transmission hole 18.
• the sound transmission hole 18 is less likely to stretch the water film due to the turbulent flow of the vortex 48, and even if the water film is stretched, the water film can be broken due to the turbulent flow of the vortex 48.
• the Karman vortex generating member 4 8 Although the vortex is generated in the vicinity of the inner pipe inner wall 15, the vortex generating member is not limited to this.
• a protrusion 50 that generates a vortex 51 in the vicinity of the inner pipe inner wall 15 in the modification shown in FIGS. 18 and 19.
• the protrusion 50 is provided on the upstream side of each hole for each sound transmission hole 18.
• the projection 50 protrudes from the inner pipe inner wall 15 toward the inner pipe axis F as shown in FIG.
• the shape of the protrusion 50 is set such that the flow along the inner wall 15 of the inner pipe 14 j is easily separated as much as possible.
• Fig. 20 schematically shows a longitudinal section of the silencer.
• Fig. 21 shows a longitudinal cross-sectional view of the inner pipe in the silencer of the modified example
• Fig. 22 shows a view of the inner pipe shown in Fig. 21 from the direction indicated by arrow D.
• the silencer 10 according to the present embodiment is provided with a conduction means for allowing a part of the exhaust gas flowing into the inner pipe to flow out from the upstream sound transmission hole to the sound absorption chamber. Unlike the above, the details are explained below.
• symbol is attached
• the flow guide means causes a part of the exhaust gas flowing in the inner pipe 14 to flow out from the inner pipe 14 to the sound absorbing chamber 17 through the upstream sound transmission hole 18 g. That is, the flow guide means forms an exhaust flow from the inner pipe 14 toward the sound absorption chamber 17 in the upstream sound transmission hole 18 g.
• the sound absorbing chamber 17 is a space enclosed by the outer wall of the inner pipe and the inner wall of the outer shell except for the sound transmitting holes 18 g and 18 h.
• the exhaust gas that has flowed out into the sound absorption chamber 17 flows again into the inner pipe 14 through the sound transmission hole 18 h on the downstream side. In the downstream sound transmission hole 1 8 h, An exhaust flow is formed from the sound chamber 17 into the inner pipe 14.
• a narrowed portion 52 is formed in the inner pipe 14k as the flow guiding means.
• the throttle portion 52 is a portion where the area of the cross section of the flow path formed in the inner pipe 14 k (the cross section perpendicular to the axial center F of the inner pipe 14) is smaller than other parts. It is installed in the middle of the pipe 14k. Sound transmission holes 18 g and 18 h are respectively formed on the upstream side and the downstream side of the throttle portion 52.
• the upstream sound transmission hole 18 g flows from the inner pipe 14 k toward the sound absorbing chamber 17. And an exhaust flow that flows from the sound absorption chamber 17 into the inner pipe 14k through the sound transmission hole 18h on the downstream side. For this reason, it is difficult for the water film to stick to the upstream and downstream sound transmission holes 18 g and 18 h. Even if the water film is stretched, the water film can be broken by the exhaust flow passing through the sound transmission holes 18 g and 18 h.
• the flow guide means is not limited to this.
• the flow guide means is not limited to this.
• the duct 54 is provided on the inner wall 15 of the inner pipe 14 1 corresponding to each of the upstream sound transmission holes 18 g.
• the duct 5 4 protrudes from the inner wall 15 of the inner pipe 1 4 1 toward the axis F of the inner pipe 1 4 1 and opens toward the upstream side. . '
• the flow along the inner pipe inner wall 15 is from the opening of the duct 5 4 (upstream Through the sound transmission hole 1 8 and out into the sound absorption chamber 17. Since the pressure in the sound absorption chamber 17 increases due to the exhaust gas flowing into the sound absorption chamber 17, the exhaust gas flowing out into the sound absorption chamber 17 has a downstream sound transmission hole 1 8 as indicated by an arrow R in FIG. It flows again into the inner pipe 1 4 1 through h.
• the silencer 10 0 i of this embodiment will be described with reference to FIG. Figure 23 schematically shows the silencer and its peripheral equipment.
• the silencer 10 i of this embodiment is different from the silencer 10 of the first embodiment in that it includes gas injection means for injecting gas into the sound absorption chamber, and the details will be described below.
• the same components as those of the silencer 10 of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
• the gas injection means directly injects the gas into the sound absorption chamber 17 from the outside of the silencer 10 0 i separately from the exhaust flow flowing into the inner pipe 14 from the upstream of the exhaust system. Injected Since the gas pressure is set to be higher than the pressure in the inner pipe 14, when the gas is injected into the sound absorbing chamber 17, the gas in the sound absorbing chamber 17 is changed from the sound transmitting hole 18 to the inner pipe. 1 Flows into 4. In this way, by injecting the gas into the sound absorbing chamber 17, it is possible to form a flow that flows through the sound transmitting hole 18 from the sound absorbing chamber 17 toward the inner pipe 14.
• the silencer 10 of the present embodiment can suppress the formation of a water film in the sound transmission hole.
• the blower 8 6 supplies the oxidizing gas (air) to the fuel cell body 8 2 a via the oxidizing gas supply path 8 7, the oxidizing gas supply path 8 7 Oxidizing gas is also supplied to the bypass channel 60 (indicated by an arrow T in the figure).
• the oxidizing gas supplied to the bypass channel 60 flows into the sound absorbing chamber 17 from the gas injection 58 of the air shell 12 as indicated by the arrow U.
• the oxidizing gas supplied to the fuel cell body 8 2 a is exhausted from the fuel cell body 8 2 a as exhaust gas, and the flow rate is adjusted by the adjustment valve 8 2 b. 1 0 i flows into the inner pipe 1 4.
• the pressure of the oxidizing gas flowing through the nopass flow path 60 (the pressure of the oxidizing gas injected into the sound absorption chamber) is set to be higher than the pressure of the exhaust gas flowing through the inner pipe 14.
• the oxygen gas flowing into the sound absorbing chamber 17 from the inlet 58 flows into the inner pipe 14 from the sound absorbing chamber 17 through the sound transmission hole 1 8.
• the silencer 10 of the present embodiment by providing the bypass flow path 60 that directly connects the oxidizing gas supply path 87 outside the silencer 10 and the inside of the sound absorption chamber 17, the sound absorption is achieved. From the sound chamber 17 to the inner pipe 14, a gas flow that flows through the sound transmission hole 18 can be formed. Thereby, it is possible to suppress the water film from being stretched on the sound transmission hole.
• a valve (not shown) in the bypass flow path 60 of the present embodiment and open and close it momentarily. By opening and closing the valve momentarily, a pressure wave is generated in the oxidizing gas downstream from the valve. The pressure wave propagates through the sound absorbing chamber 17 to the sound transmitting hole 18, thereby breaking the water film stretched on the sound transmitting hole.
• the silencer 10 j of the present embodiment will be described with reference to FIGS.
• FIG. 24 shows a longitudinal sectional view of the inner pipe 14, and
• FIG. 25 shows a view of the inner pipe 14, whose cross section is shown in FIG.
• the silencer 10 j of the present embodiment is the silencer of the first embodiment in that the sound transmission hole and the peripheral portion of the sound transmission hole are formed to protrude toward the axis of the inner pipe. Unlike 1 0, the details are explained below.
• symbol is attached
• the sound transmission hole 18 i and its peripheral portion 6 2 are directed from the inner wall 15 of the inner pipe 14 m toward the inner pipe axis F as shown in FIGS. 24 and 25. Protrusively provided. Exhaust gas flowing along inner wall 1 5 of inner pipe 1 4 ( (Indicated by arrow V) is biased toward the inner pipe axis ⁇ F side by the peripheral part 6 2 of the sound transmission hole 1 8 i, so that there is a relative flow between the sound transmission hole 1 8 i and the inner pipe axis F. A fast contraction region 6 4 (enclosed by a two-dot chain line in Fig. 24) is formed. That is, the sound transmission hole 18 i is exposed to a fast exhaust flow.
• the silencer 10 j of the present embodiment even if a water film is stretched on the sound transmission hole 18 i, the sound transmission hole 18 i is exposed to a relatively fast flow. As a result, the water film becomes thinner due to deformation in the downstream direction, and the water film of the sound transmission hole 18 i is easily broken. As a result, it is possible to suppress the formation of a water film in the sound transmission hole.
• FIG. Fig. 26 schematically shows a longitudinal section of the silencer
• Fig. 27 schematically shows a perspective view of the inner case constituting the silencer.
• the silencer 1 Ok according to the present embodiment includes an air shell through which exhaust gas flows, and an inner case in which a plurality of through holes are formed in a wall surface and a sound absorbing material is filled therein. Unlike the silencer 10 of the first embodiment, however, the details will be described below in that it is arranged over the entire flow path cross section of the air shell.
• the inner case 66 is a substantially rectangular hard case, and the wall surface 68 has a plurality of through holes 18 j formed therein. Specifically, among the wall surfaces 6 8 constituting the inner casing 6 6, a through hole 1 8 j is formed in the upstream side wall surface 6 8 a and the downstream side wall surface 6 8 b opposite to the upstream side wall surface 6 8 a. Gas can flow from the side wall surface 6 8 a to the downstream side wall surface 6 8 b.
• the inner side of the inner case wall surface 6 8, that is, the inner case 66 is filled with a sound absorbing material 16, which functions as the sound absorbing chamber 17.
• the inner case 66 described above is housed and held inside the outer shell 12 d as shown in FIG.
• a flow path 70 is formed inside the outer shell 12 d, and an inner case 66 is disposed so as to close the flow path 70.
• the wall surface 6 8 upstream side wall surface 6 8 a, downstream side
• Walls 6 8 b are arranged.
• the wall surface 6 8 having the through hole 1 8 j of the inner case 6 6 is set to be as wide as possible.
• FIG. Fig. 28 shows a longitudinal cross-sectional view of the silencer
• Fig. 29 shows a view of the plate-like member constituting the silencer as seen from the direction indicated by arrow D.
• the silencer 1 O m of the present embodiment has a shell through which the exhaust gas flows and a plate-like member in which a plurality of through holes are formed, and the plate-like member passes through the inside of the shell in the flow direction of the exhaust gas.
• the details will be described below in that it is partitioned by a vertical surface.
• the plate member 72 is a hard plate material having a substantially circular shape, and a plurality of through holes 18 k are formed in the wall surface 73.
• a flow path 75 having a substantially circular cross section is formed inside the shell 74 as shown in FIG.
• a plurality of plate-like members 7 2 are arranged inside the shell 74 so as to partition the flow path 75 inside the seal 74 with a plane perpendicular to the flow direction of the exhaust gas (the direction indicated by the arrow D). Yes.
• the through-hole 18 k of the plate-like member 72 passes through in the same direction as the exhaust flow direction.
• the exhaust gas flowing in from the direction indicated by the arrow D flows through the through hole 18 k of the plate-like member 72 as indicated by the arrow X.
• the exhaust flow indicated by arrow D is a turbulent flow generated upstream of the exhaust system, and this turbulent flow is rectified by flowing through a plurality of through-holes 18 k formed in the plate-like member 72. .
• the turbulent flow is rectified every time it passes through the through holes 18 k of each plate-like member, so that it is transmitted from the upstream side of the exhaust system to the inside of the shell 74.
• the sowing sound will be muted.
• the silencer for a fuel cell according to the present invention is useful as a silencer provided in an exhaust system of a fuel cell.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Combustion & Propulsion (AREA)
• Sustainable Development (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Sustainable Energy (AREA)
• Life Sciences & Earth Sciences (AREA)
• Manufacturing & Machinery (AREA)
• Fuel Cell (AREA)
• Exhaust Silencers (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=37570581

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (32)

Citations (8)

Family Cites Families (20)

• 2005
  • 2005-06-24 JP JP2005185371A patent/JP2007005178A/ja not_active Withdrawn
• 2006
  • 2006-06-21 DE DE112006001389T patent/DE112006001389T5/de not_active Withdrawn
  • 2006-06-21 WO PCT/JP2006/312841 patent/WO2006137570A1/ja not_active Ceased
  • 2006-06-21 US US11/920,432 patent/US20090045006A1/en not_active Abandoned
  • 2006-06-21 CN CNB2006800148661A patent/CN100549371C/zh not_active Expired - Fee Related

Patent Citations (8)

Also Published As

Similar Documents

Legal Events