JP6660343B2 - Silencer - Google Patents

Description

  According to the present invention, a first partition into which an inlet pipe is inserted, and an outlet pipe having a different gas flow direction from the inlet pipe are inserted into a shell formed by connecting the first and second shell halves to each other. And a muffler provided with a second partition wall.

  Such a silencer is known, for example, from Patent Document 1.

JP 2015-14209 A

  In the silencer disclosed in Patent Document 1, the inlet pipe and the outlet pipe are formed to be curved in the shell, and the inlet pipe and the outlet pipe are inserted through a pair of partition walls arranged in parallel with each other. Therefore, it is difficult to position the pair of partition walls when assembling the muffler, and there is a problem that high precision is required for inserting the inlet pipe and the outlet pipe into the pair of partition walls.

  The present invention has been made in view of such circumstances, and has as its object to provide a muffler that facilitates positioning of a pair of partition walls in a shell.

In order to achieve the above object, the present invention provides a fuel cell system comprising: a first partition in which an inlet pipe is inserted in a shell in which a first and a second shell half are connected to each other; A muffler provided with a second partition into which an outlet pipe having a different shape is inserted, and a part of the outer periphery of one of the first and second partitions, and the other of the first and second partitions. A contact portion extending in a straight line so as to contact the flat portion of the first partition and the remaining portion of the outer periphery of one of the first partition and the second partition except for the contact portion; and the other of the outer periphery of the partition wall and the second partition wall is joined to the inner surface of the shell, the shell, the acoustic chamber defined by the first partition and the second partition wall other and the shell is formed The outlay The portion surrounded by sound absorbing material filled in the acoustic chamber of the heat pipe, the first, wherein a plurality of small holes are bored.

According to the present invention, in addition to the configuration of the first aspect , the first shell half is formed in an upwardly-opening bowl shape having a flat bottom wall, and the second shell half is formed of the bottom wall. The ceiling wall is formed in a bowl shape that opens downward while having a ceiling wall facing the ceiling wall, and the ceiling wall has a lower portion whose interval with the bottom wall is smaller than other portions of the ceiling wall, and a lower portion than the lower portion. And a connecting portion connecting the lower portion and the higher portion by bending so as to approach the bottom wall toward the lower portion side. , The outer periphery of the second partition having the flat portion is joined to the first and second shell halves such that the outer periphery of the second partition abuts on the lower portion and the bottom wall of the ceiling wall, and A contact portion provided on a part of the outer periphery of the first partition wall is in contact with the flat portion, and In Le, a second feature in that the pair of resonance chambers which are arranged on both sides of the first partition wall with interposed between the second partition wall the sound absorbing chamber is formed.

According to the present invention, a first partition into which an inlet pipe is inserted, and an outlet pipe having a different gas flow direction from the inlet pipe are inserted into a shell formed by connecting the first and second shell halves to each other. A silencer provided with a second partition to be provided, a part of the outer periphery of the first partition is provided with a contact portion extending linearly so as to contact a flat portion of the second partition, The remaining portion of the outer periphery of the first partition other than the contact portion and the outer periphery of the second partition are joined to the inner surface of the shell, and the first shell half has a flat bottom wall. A second shell half having a ceiling wall facing the bottom wall and having a bowl shape opened downward, wherein the ceiling wall is spaced from the bottom wall. A lower portion smaller than the other portion of the ceiling wall, A higher portion having a larger distance from the bottom wall than the lower portion, and a connecting portion that curves so as to approach the bottom wall toward the lower portion and connects the lower portion and the higher portion. And the outer periphery of the second partition wall is joined to the first and second shell halves such that the outer periphery of the second partition wall comes into contact with the lower portion and the bottom wall of the ceiling wall, and the flat portion of the second partition wall is formed. And a contact portion provided on a part of the outer periphery of the first partition is in contact with the first partition, and the second partition is interposed between the first partition and the sound absorbing chamber in the shell, and is disposed on both sides of the first partition. A third feature is that a pair of resonance chambers is formed.

Further, according to the present invention, in addition to any one of the first to third features, the first partition and the second partition are arranged orthogonally, and are inserted into at least the first partition of the inlet pipe. A fourth feature is that a portion is disposed orthogonal to the first partition, and at least a portion of the outlet pipe inserted into the second partition is disposed orthogonal to the second partition.

  According to the first feature of the present invention, the contact portion formed on a part of the outer circumference of one of the first partition and the second partition and extending linearly has a flat surface that the other of the first partition and the second partition has. Abuts on the inner surface of the shell because the remaining portion of the outer periphery of one of the first and second partitions except for the abutting portion and the other outer periphery of the first and second partitions are joined to the inner surface of the shell. At the time of assembling, the first and second partitions are supported by the inner surface of the shell and are supported by the mutual contact portions of the first and second partitions, so that the positioning of the first and second partitions in the shell is achieved. This facilitates the production of the muffler, thereby reducing costs. In addition, the rigidity of the first and second partitions can be increased, and the vibration of those partitions can be suppressed.

Also, the sound absorbing material is filled in the sound absorbing chamber that is formed in the shell, a plurality of small holes in a portion surrounded by the sound absorbing material of the outlet pipe is drilled, the effect of high-frequency sound in the vicinity of the outlet of the gas Can be effectively reduced .

According to the second and third features of the present invention, the outer periphery of the second partition having the flat portion contacts the bottom wall of the first shell half and the lower portion of the ceiling wall of the second shell half. In this way, the first and second shell halves are joined to each other, so that the positioning of the second partition wall in the joining direction of the first and second shell halves is improved.

Further, according to the fourth feature of the present invention, the first partition and the second partition are arranged orthogonally, and at least a portion of the inlet pipe inserted into the first partition is orthogonal to the first partition, and at least the outlet pipe has Since the portion inserted into the second partition is orthogonal to the second partition, even if the inlet pipe and the outlet pipe are substantially straight pipes, the direction of gas inflow and outflow can be changed by almost 90 degrees. Is increased.

It is a cross-sectional plan view of a silencer. FIG. 2 is a longitudinal sectional side view of the silencer as viewed from the direction of arrow 2 in FIG. 1. FIG. 3 is a sectional view taken along line 3-3 of FIG. 1. FIG. 4 is an enlarged view of a portion indicated by arrow 4 in FIG. 3. FIG. 5 is a side view of the second partition wall and the outlet pipe as viewed from the direction of arrows 5-5 in FIG. 1.

  Hereinafter, an embodiment of the present invention will be described with reference to the attached FIGS. 1 to 5. First, in FIGS. 1 to 3, for example, a shell 11 of a silencer used in an exhaust system of an internal combustion engine for a four-wheel vehicle is provided. , The first and second shell halves 12 and 13 are connected to each other. The first shell half 12 is formed in an upwardly open bowl shape having a planar bottom wall 12a. The second shell half 13 has a ceiling wall 13a facing the bottom wall 12a and is formed in a bowl shape opened downward. At the upper end of the first shell half 12, a first flange 12b extending laterally is integrally formed, and at the lower end of the second shell half 13, a second flange 13b extending laterally is integrally formed. The first and second flanges 12b, 13b are connected to each other by welding.

  The ceiling wall 13a of the second shell half 13 has a lower portion 13aa in which the distance from the bottom wall 12a of the first shell half 12 is smaller than other portions of the ceiling wall 13a, and the lower portion 13aa. A higher portion 13ab having a larger distance from the bottom wall 12a than the lower portion 13aa, and a connecting portion 13ac which curves toward the lower wall 12a toward the lower portion 13aa and connects the low portion 13aa and the high portion 13ab. Are formed.

  In the shell 11, a first partition 17 through which the inlet pipe 14 is inserted and a second partition 18 through which the first and second outlet pipes 15 and 16 are inserted are provided. The gas flow direction in the inlet pipe 14 is the direction shown by the arrow 19 in FIG. 1, while the gas flow direction in the first and second outlet pipes 15 and 16 is the direction shown by the arrow 20 in FIG. In the inlet pipe 14 and the first and second outlet pipes 15 and 16, the gas flow directions are set to be different from each other by substantially 90 degrees in this embodiment.

  Referring also to FIG. 4, a contact portion extending linearly on a part of the outer periphery of one of the first partition 17 and the second partition 18, in this embodiment, a part of the outer periphery of the first partition 17. 21 is provided, and the contact portion 21 is brought into contact with the flat portion 22 of the other of the first partition 17 and the second partition 18. In this embodiment, the first partition wall 17 is formed by integrally providing a first flange portion 17b projecting to one side of the first flat plate portion 17a on the outer periphery of the flat first flat plate portion 17a, and Reference numeral 21 is formed so that a part of the first flange portion 17b extends linearly. Further, the second partition wall 18 is formed by integrally providing a second flange portion 18b projecting to one side of the second flat plate portion 18a on the outer periphery of the flat second flat plate portion 18a. It is formed as a part of the two flat plate portions 18a. The remaining portion of the outer periphery of the first partition 17 other than the abutment portion 21 of the first flange 17 b and the second outer periphery 18 b of the second partition 18 are joined to the inner surface of the shell 11. Is done.

  Incidentally, the first partition 17 and the second partition 18 are arranged orthogonal to each other, and a sound absorbing chamber 24 defined by the second partition 18 and the shell 11 is formed in the shell 11. At the same time, a pair of resonance chambers 25 and 26 arranged on both sides of the first partition 17 with the second partition 18 interposed between the sound absorbing chamber 24 and the second partition 18 are formed.

  In addition, at least a portion of the inlet pipe 14 that is inserted into the first partition 17 is disposed orthogonal to the first partition 17. In this embodiment, the inlet pipe 14 is connected to the first partition 17. The straight tube portion 14a inserted into the tube 17 and a bent tube portion 14b bent slightly from one end of the straight tube portion 14a are integrally formed. In the second shell half 13 of the shell 11, the bent tube portion 14b is inserted into and supported by an inlet side support tube portion 27 provided at the connection portion 13ac of the ceiling wall 13a, and one end of the bent tube portion 14b is supported. Is opened to the outside of the shell 11 to function as an inlet 28, and the straight pipe portion 14a inserted into the first flat plate portion 17a of the first partition 17 is connected to the first flat plate portion by two upper and lower welded portions 23. The other end of the straight pipe portion 14a is opened to one of the pair of resonance chambers 25 and 26.

  By the way, the second flange portion 18b on the outer periphery of the second partition wall 18 comes into contact with the bottom wall 12a of the first shell half 12 and the lower portion 13aa of the ceiling wall 13a of the second shell half 13. The first and second outlet pipes 15, 16 are joined to the first and second shell halves 12, 13, and at least portions of the first and second outlet pipes 15, 16 inserted through the second partition 18 are orthogonal to the second partition 18. In this embodiment, both the first and second outlet pipes 15 and 16 are formed in a straight tubular shape.

  Referring also to FIG. 5, the first and second outlet pipes 15 and 16 are arranged in parallel such that the first outlet pipe 15 is arranged between the first partition wall 17 and the second outlet pipe 16. The first and second outlet pipes 15 and 16 inserted into the second flat plate portion 18a of the second partition wall 18 are joined to the second flat plate portion 18a by two upper and lower welded portions 29. One end of the first and second outlet pipes 15 and 16 is open to the other 26 of the pair of resonance chambers 25 and 26, and the first flange 12b of the first shell half 12 and the second shell First and second outlet pipes 15, 16 are formed in first and second outlet connection pipe sections 30, 31 formed by bending a part of the second flange 13b of the half body 13 into a semicircular shape, respectively. The other ends of the first and second outlet pipes 15 and 16 are opened as outlets 32 and 33 outside the shell 11 respectively.

  A plurality of first small holes 35 and 36 are formed in portions of the first and second outlet pipes 15 and 16 surrounded by the sound absorbing material 34 filled in the sound absorbing chamber 24, respectively. The first partition 17 is provided with a plurality of communication holes 37 for allowing the pair of resonance chambers 25 and 26 to communicate with each other, and the second partition 18 is provided with the other resonance chamber 26 through the sound absorbing chamber. A plurality of second small holes 38 communicating with 24 are formed.

  On the bottom wall 12a of the first shell half 12 and on the ceiling wall 13a of the second shell half 13, a first arrangement groove 39 extending linearly so as to arrange the first flange portion 17b is formed on the bottom wall 12a. Two sets of first protrusions 40 are formed on the inner surfaces of the wall 12a and the ceiling wall 13a, and each of the first protrusions 40 protrudes outward, respectively, and corresponds to the first partition 17 of the shell 11. The first flange portion 17b is joined to the shell 11 by a plurality of welds 41 which fill slits (not shown) formed at a plurality of portions of the portion.

  In addition, the bottom wall 12a of the first shell half 12 and the lower portion 13aa of the ceiling wall 13a of the second shell half 13 extend linearly so as to arrange the second flange 18b. Two sets of second protrusions 43 project outward so as to form two arrangement grooves 42 on the inner surfaces of the bottom wall 12a and the lower portion 13aa, respectively. The second flange portion 18b is joined to the shell 11 by a plurality of welded portions 44 that fill in slits (not shown) formed at a plurality of portions corresponding to the second partition wall 18.

  Next, the operation of this embodiment will be described. A first partition wall 17 into which an inlet pipe 14 is inserted is inserted into a shell 11 formed by connecting first and second shell halves 12 and 13 to each other. The pipe 14 is provided with a second partition 18 through which first and second outlet pipes 15 and 16 having different gas flow directions are inserted, and the first partition 17 and the second partition 18 are provided. One part of the outer periphery of the first partition 17 which is one of the first partitions 17 and the second partition 18, which is the other of the second partitions 18, is in contact with the flat portion 22 of the second partition 18 and extends linearly. A portion 21 is provided, and the remaining portion of the outer periphery of the first partition 17 other than the abutting portion 21 and the outer periphery of the second partition 18 are joined to the inner surface of the shell 11. , The first and second partitions 17 and 18 are supported by the inner surface of the shell 11 and are supported by the mutual abutting portions of the first and second partitions 17 and 18, so that the first and second partitions in the shell 11 are provided. The positioning of the partitions 17 and 18 is facilitated, whereby the production of the silencer is facilitated and the cost can be reduced. In addition, the rigidity of the first and second partition walls 17 and 18 can be increased, and the vibration of those partition walls can be suppressed.

  In the shell 11, a sound absorbing chamber 24 defined by the shell 11 and the second partition 18, which is the other of the first partition 17 and the second partition 18, is formed, and the first and second outlets are formed. Since a plurality of first small holes 35 and 36 are formed in the pipes 15 and 16 at a portion surrounded by the sound absorbing material 34 filled in the sound absorbing chamber 24, high-frequency sound is produced near the gas outlet. Can be effectively reduced.

  Further, the first partition wall 17 and the second partition wall 18 are arranged orthogonally, and at least a portion of the inlet pipe 14 inserted into the first partition wall 17 is arranged orthogonally to the first partition wall 17. Since at least a portion of the first and second outlet pipes 15 and 16 inserted into the second partition 18 is arranged orthogonal to the second partition 18, the inlet pipe 14 and the first and second outlet pipes are provided. Even if the pipes 15 and 16 are substantially straight pipes, the direction in which gas enters and exits can be changed by about 90 degrees, and the degree of freedom in arrangement of the muffler increases.

  Further, the first shell half 12 is formed in a bowl shape opened upward with a flat bottom wall 12a, and the second shell half 13 has a ceiling wall 13a facing the bottom wall 12a. A lower portion 13aa formed in a bowl shape opened downward, the ceiling wall 13a having a smaller distance from the bottom wall 12a than other portions of the ceiling wall 13a, and the lower wall 13aa being lower than the lower portion 13aa. The upper portion 13ab having a larger distance from the lower portion 12a, and a connecting portion 13ac that curves so as to approach the bottom wall 12a toward the lower portion 13aa and connects the lower portion 13aa and the higher portion 13ab. The first and second shells are formed such that the outer periphery of the second partition wall 18 having the flat portion 22 is in contact with the lower portion 13aa and the bottom wall 12a of the ceiling wall 13a. The contact portion 21 provided on a part of the outer periphery of the first partition 17 is in contact with the flat portion 22 of the second partition 18, and the second portion 18 is provided in the shell 11. Since the partition 18 is interposed between the sound absorbing chamber 24 and the pair of resonance chambers 25 and 26 arranged on both sides of the first partition 17, the first and second shell halves 12 and 13 are connected. The positioning of the second partition 18 in the direction can be enhanced.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

  For example, in the above-described embodiment, the case where the first and second outlet pipes 15 and 16 are used has been described. However, the present invention can be applied to a case where only one outlet pipe is used.

11 Shell 12 First shell half 12a Bottom wall 13 Second shell half 13a Ceiling wall 13aa Low portion 13ab High portion 13ac · Connecting part 14 ··· Inlet pipes 15 and 16 ··· Outlet pipe 17 ··· First partition 18 ··· Second partition 21 ··· Contact part 22 ··· Plane part 24 ··· Sound absorbing chamber 25, 26 ... resonance chamber 34 ... sound absorbing material 35, 36 ... small hole

Claims (4)

A first partition wall (17) into which an inlet pipe (14) is inserted and a first partition wall (17) into which a first and second shell halves (12, 13) are connected to each other; And a second partition wall (18) into which outlet pipes (15, 16) having different gas flow directions are inserted.
One part of the outer periphery of one of the first partition (17) and the second partition (18) is in contact with a flat portion (22) of the other of the first partition (17) and the second partition (18). A contact portion (21) extending linearly so as to be in contact with the first partition wall (17) and a remaining portion of the outer periphery of the one of the first partition wall (17) and the second partition wall (18) except for the contact portion (21) is provided. And the other outer periphery of the first partition (17) and the second partition (18) are joined to the inner surface of the shell (11) ,
In the shell (11), a sound absorbing chamber (24) defined by the other of the first partition (17) and the second partition (18) and the shell (11) is formed, and the outlet pipe (15) is formed. , the portion surrounded by sound absorbing material is filled (34) to said acoustic chamber (24) out of 16), the silencer characterized by Rukoto plurality of small holes (35, 36) is bored. The first shell half (12) has a flat bottom wall (12a) and is formed in a bowl shape opened upward, and the second shell half (13) faces the bottom wall (12a). The ceiling wall (13a) is formed in a bowl shape that opens downward while having a ceiling wall (13a), and the space between the ceiling wall (13a) and the bottom wall (12a) is smaller than that of other parts of the ceiling wall (13a). A lower portion (13aa), a higher portion (13ab) in which the distance between the bottom wall (12a) is larger than the lower portion (13aa), and the bottom wall (12aa) toward the lower portion (13aa). ), The second partition wall (13ac) is formed to have a connecting portion (13ac) that curves between the lower portion (13aa) and the higher portion (13ab) and that has the flat portion (22). 18) is the outer periphery of the ceiling wall (13a). The first and second shell halves (12, 13) are joined so as to be in contact with the base portion (13aa) and the bottom wall (12a), and the flat portion (22) of the second partition wall (18). A contact portion (21) provided on a part of the outer periphery of the first partition (17) is in contact with the first partition (17), and the second partition (18) is connected to the sound absorbing chamber (24) in the shell (11). 2. The muffler according to claim 1, wherein a pair of resonance chambers (25, 26) interposed therebetween and arranged on both sides of the first partition (17) are formed. A first partition wall (17) into which an inlet pipe (14) is inserted and a first partition wall (17) into which a first and second shell halves (12, 13) are connected to each other; And a second partition (18) through which outlet pipes (15, 16) having different gas flow directions are inserted,
A contact portion (21) extending linearly so as to contact a flat portion (22) of the second partition (18) is provided on a part of the outer periphery of the first partition (17). The remaining portion of the outer periphery of the first partition (17) except for the contact portion (21) and the outer periphery of the second partition (18) are joined to the inner surface of the shell (11),
The first shell half (12) has a flat bottom wall (12a) and is formed in a bowl shape opened upward, and the second shell half (13) faces the bottom wall (12a). The ceiling wall (13a) is formed in a bowl shape that opens downward while having a ceiling wall (13a), and the space between the ceiling wall (13a) and the bottom wall (12a) is smaller than that of other parts of the ceiling wall (13a). A lower portion (13aa), a higher portion (13ab) in which a distance between the lower portion (13aa) and the bottom wall (12a) is larger than the lower portion (13aa), and a lower portion (12aa) closer to the lower portion (13aa). ) Is formed so as to have a connecting portion (13ac) connecting between the lower portion (13aa) and the higher portion (13ab) by bending so as to approach the upper portion, and an outer periphery of the second partition wall (18) is provided on the ceiling. The lower part (13aa) and the front of the wall (13a) The first and second shell halves (12, 13) are joined so as to contact the bottom wall (12a), and the first partition (17) is attached to the flat portion (22) of the second partition (18). The contact portion (21) provided on a part of the outer periphery of the shell is in contact with the second partition (18) in the shell (11) between the second partition (18) and the sound absorbing chamber (24). A muffler characterized in that a pair of resonance chambers (25, 26) arranged on both sides of one partition (17) are formed. The first partition (17) and the second partition (18) are arranged orthogonally, and at least a portion of the inlet pipe (14) inserted into the first partition (17) is the first partition (17). And at least a portion of the outlet pipe (15, 16) inserted into the second partition (18) is disposed orthogonal to the second partition (18). Item 4. The muffler according to any one of Items 1 to 3 .

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