JPH0663813U - Active silencer - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to an active silencer in which the noise of exhaust gas is positively silenced by a secondary sound source, and to reliably connect the silencer body and the exhaust pipe. In addition, the secondary sound source can be attached / detached to / from the silencer body much more easily than before. A muffler body 41 is partitioned by a partition wall 61 to form a muffler chamber 51, and an exhaust pipe 49 that circulates exhaust gas is inserted into the muffler chamber 51 to form an opening 61a formed in the partition wall 61. In the active silencer in which the secondary sound source 63 is arranged, the silencer main body 41 is provided with the exhaust pipe insertion portion 43 through which the exhaust pipe 49 is inserted, and the partition wall 6
1 and the speaker part 45 in which the speaker 63 is arranged, and the exhaust pipe insertion part 43 and the speaker part 45 are connected via a heat insulating material 73.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an active silencer in which exhaust noise is positively silenced by a secondary sound source.

[0002]

[Prior art]

 Conventionally, as an active silencer that positively silences the noise of exhaust gas by a secondary sound source, for example, one disclosed in Japanese Patent Laid-Open No. 3-174198 is known.

FIG. 6 shows an active silencer of this type. In the figure, reference numeral 11 indicates a silencer body. The muffler body 11 is divided into three parts by a partition wall 13 arranged at a predetermined interval, a muffling room 15 is formed in the center, and speaker rooms 17 are formed on both sides of the muffling room 15.

An exhaust pipe 19 that circulates the exhaust gas G is inserted into the muffler chamber 15. The exhaust pipe 19 has a large number of small exhaust pipes in a portion located inside the muffler chamber 15. The hole 21 is formed.

An opening 23 is formed in the pair of partition walls 13 at a position facing each other around the exhaust pipe 19, and a speaker 25 as a secondary sound source is arranged in the opening 23. A protective plate 27 for protecting the speaker 25 is arranged in the opening 23 of the partition wall 13, and a large number of small holes 29 are formed in the protective plate 27.

A sound absorbing material 31 made of, for example, glass wool is housed in the muffling room 15 and the speaker room 17. In addition, a microphone 33 is arranged in the muffling chamber 15.

In such an active silencer, the noise of the exhaust gas G is detected by the microphone 33, and the erasing sound having a phase opposite to the detected noise is emitted from the speaker 25, so that the so-called active muffling is performed. Is done.

[0008]

[Problems to be solved by the device]

 However, in such a conventional active silencer, since the silencer main body 11 and the exhaust pipe 19 are thermally connected, the heat of the exhaust pipe 19 flows from the exhaust pipe 19 into the silencer main body 11, There has been a problem that the speaker 25 and the like incorporated in the silencer body 11 are markedly damaged by heat.

Further, since it is difficult to attach / detach the speaker 25 to / from the muffler body 11, there is a problem that the speaker 25 cannot be quickly repaired or replaced. The present invention has been made in order to solve such a conventional problem.The silencer body and the exhaust pipe can be reliably connected to each other, and the secondary sound source can be attached / detached to / from the silencer body more greatly than ever before. It is an object to provide an active silencer that can be facilitated.

[0010]

[Means for Solving the Problems]

 In the active silencer of the present invention, the silencer body is partitioned by a partition wall to form a muffler chamber, and an exhaust pipe that circulates exhaust gas is inserted into this muffler chamber, and an opening formed in the partition wall In an active silencer having a next sound source arranged, the silencer body is divided into an exhaust pipe insertion portion through which the exhaust pipe is inserted and a speaker portion where the partition wall and the speaker are arranged, and the exhaust gas is exhausted. The tube insertion part and the speaker part are connected via a heat insulating material.

[0011]

[Action]

 In the active silencer of the present invention, the silencer body is divided into an exhaust pipe insertion portion through which the exhaust pipe is inserted and a speaker portion where the partition wall and the speaker are arranged, and the exhaust pipe insertion portion and the speaker portion are separated. Since it is connected via a heat insulating material, it is not necessary to thermally separate the exhaust pipe and the silencer body at the exhaust pipe insertion part of the silencer body, and the exhaust pipe and the silencer body are directly connected firmly by welding or the like. be able to.

Further, by removing the speaker unit from the exhaust pipe insertion unit, the secondary sound source can be quickly attached and detached.

[0013]

【Example】

 Hereinafter, the details of the present invention will be described with reference to the embodiments shown in the drawings. 1 and 2 show a first embodiment of an active silencer of the present invention, in which reference numeral 41 designates a cylindrical silencer body.

The silencer body 41 is divided into an exhaust pipe insertion portion 43 and a speaker portion 45. An exhaust pipe 49 that circulates the exhaust gas G is inserted in the center of both end plates 47 of the exhaust pipe insertion portion 43, and the exhaust pipe 49 is fixed to the both end plates 47 by welding.

A large number of small holes 49 a are formed in a portion of the exhaust pipe 49 located inside the muffling chamber 51. A sound absorbing material 53 made of, for example, glass wool is disposed on the side of the exhaust pipe insertion portion 43 opposite to the speaker portion 45, and a sound transmissive heat insulating material 55 is disposed on the speaker portion 45 side.

At the main body 43 a of the exhaust pipe insertion portion 43 and the end of the end plate 47 on the speaker portion 45 side, a connecting edge 57 is formed in a planar shape so as to project outward. Further, a microphone 59 is arranged in the exhaust pipe insertion portion 43.

The opening side of the speaker part 45 is shielded by a partition wall 61, and a speaker 63, which is a secondary sound source, such as a round speaker, is arranged in the opening part 61 a formed in the partition wall 61. .

A protective plate 65 for protecting the speaker 63 is arranged in the opening 61 a of the partition wall 61, and a large number of small holes 65 a are formed in the protective plate 65. The main body 45a of the speaker unit 45 and the ends of the both end plates 67 on the exhaust pipe insertion portion 43 side are formed with a connecting edge portion 69 projecting outward and having a planar shape.

A sound absorbing material 71 made of, for example, glass wool is arranged in the speaker portion 45. Then, the exhaust pipe insertion portion 43 and the speaker portion 45 are inserted with a heat insulating material 73 between the connection edge portion 57 of the exhaust pipe insertion portion 43 and the connection edge portion 69 of the speaker portion 45. The connecting edge portions 57 and 69 are connected by a bolt 75 and a nut 77.

In the above-described active silencer, the noise of the exhaust gas G is detected by the microphone 59, and the erasing sound having a phase opposite to the noise is emitted from the speaker 63, so-called active muffling is performed. .

Therefore, in the above-described active silencer, the silencer body 41 is divided into the exhaust pipe insertion portion 43 into which the exhaust pipe 49 is inserted and the speaker portion 45 in which the partition wall 61 and the speaker 63 are arranged. Since the exhaust pipe insertion portion 43 and the speaker portion 45 are connected via the heat insulating material 73, the silencer main body 41 and the exhaust pipe 49 can be surely connected, and the speaker inside the silencer main body 41 is connected. The attachment / detachment of 63 can be made significantly easier than in the past.

That is, in the above-described active silencer, it is not necessary to thermally separate the exhaust pipe 49 and the silencer main body 41 in the exhaust pipe insertion portion 43 of the silencer main body 41. It is possible to directly and firmly connect the container body 41 to the container body 41 by welding or the like.

Further, by removing the bolt 75 that connects the connection edge 57 of the exhaust pipe insertion portion 43 and the connection edge 69 of the speaker portion 45, the exhaust pipe insertion portion 43 and the speaker portion 45 can be easily formed. Since the speaker 63 can be separated, the speaker 63 can be attached / detached to / from the silencer main body 41 much more easily than before.

FIG. 3 shows a second embodiment of the active silencer of the present invention. In this embodiment, the partition wall 61A of the speaker section 45 has two openings 61a at a predetermined interval. Are formed, and the speakers 63 are arranged in the openings 61a.

Further, in the sound-transmitting heat insulating material 55, a large number of cavities 55a are formed in order to improve sound-transmitting property. Furthermore, the connecting edge 57 of the exhaust pipe insertion portion 43 and the connecting edge 69 of the speaker portion 45 are connected by a rivet 79.

Also in the active silencer described above, it is possible to obtain substantially the same effect as that of the first embodiment. 4 and 5 show a third embodiment of the active silencer of the present invention. In this embodiment, the silencer main body 41 has an elliptical shape, and the silencer main body 41 is inserted through the exhaust pipe. The part 43 and the speaker parts 45 formed on both sides of the exhaust pipe insertion part 43 are divided into three parts.

The connecting edge 57 of the exhaust pipe insertion portion 43 and the connecting edge 69 of the speaker portion 45 are connected by a rivet 79. Also in the above-mentioned active silencer, it is possible to obtain substantially the same effect as that of the first embodiment.

[0028]

[Effect of device]

 As described above, in the active silencer of the present invention, the silencer body is divided into the exhaust pipe insertion part through which the exhaust pipe is inserted and the speaker part where the partition wall and the speaker are arranged, and the exhaust pipe insertion part is divided. Since the speaker and speaker are connected via a heat insulating material, the silencer body can be reliably connected to the exhaust pipe, and the secondary sound source can be attached / detached to / from the silencer body much easier than before. There is an advantage that can be done.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of an active silencer of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a sectional view showing a second embodiment of the active silencer of the present invention.

FIG. 4 is a sectional view showing a third embodiment of the active silencer of the present invention.

FIG. 5 is a front view of FIG.

FIG. 6 is a sectional view showing an example of a conventional active silencer.

[Explanation of symbols]

 41 muffler body 43 exhaust pipe insertion part 45 speaker part 49 exhaust pipe 51 muffling room 61 partition wall 61a opening 63 speaker (secondary sound source) 73 heat insulating material

Claims (1)

[Scope of utility model registration request] 1. A muffler body (41) is partitioned by a partition wall (61) to form a muffler chamber (51), and an exhaust pipe (49) through which exhaust gas flows is inserted into the muffler chamber (51). An opening (61) formed in the partition wall (61)
In an active silencer in which a secondary sound source (63) is arranged in a), the silencer body (41) is provided with an exhaust pipe insertion part (43) through which the exhaust pipe (49) is inserted, It is divided into a partition part (61) and a speaker part (45) in which a speaker (63) is arranged, and the exhaust pipe insertion part (43) and the speaker part (4) are divided.
5) An active silencer characterized by being connected to 5) via a heat insulating material (73).