JPH0738606U - 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. The purpose is to securely connect the pipe. [Structure] The connection port 55a is formed in both end plates 55 of the silencer main body 51 in which the secondary sound source 67 is housed.
A tubular edge portion 57 is formed so as to project outward from 5a, and a main body side flange 59 is formed at the open end of the tubular edge portion 57. The main body side flange 59 has exhaust pipes 81, 89.
The exhaust pipe side flange 81a formed in the above is connected via the heat insulating material 83.

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. 5 shows an active silencer of this type. In the figure, reference numeral 11 denotes 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 a erasing sound having a phase opposite to the detected noise is radiated 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 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 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.

Therefore, as shown in FIGS. 6 and 7, the silencer main body 11 is divided into an exhaust pipe insertion portion 41 into which the exhaust pipe 19 is inserted and a speaker portion 43 in which the partition wall 13 and the speaker 25 are arranged. However, an active silencer having a structure in which the exhaust pipe insertion portion 41 and the speaker portion 43 are connected by a bolt 47 and a nut 49 via a heat insulating material 45 has been considered. In this active silencer, the silencer body is Since the exhaust pipe 19 and the exhaust pipe 19 can be more firmly connected to, for example, the welding W, it is possible to eliminate the fear that the silencer main body 11 rotates.

However, in this active silencer, the silencer main body 11 is divided in the axial direction, so that the cylindrical portion 11A of the silencer main body 11 and the both end plates 11B should be joined together by tightening. However, there is a problem in that the strength of the silencer body 11 is reduced.

The present invention has been made to solve the above-described conventional problems, and provides an active silencer that can reliably connect the silencer body and the exhaust pipe without dividing the silencer body. The purpose is to

[0012]

[MEANS FOR SOLVING THE PROBLEMS] The active muffler of the present invention is a tubular structure protruding outward from the connection port formed on both end plates of the muffler body in which the secondary sound source is housed. In addition to forming the edge part, a main body side flange is formed at the open end of this tubular edge part, and the exhaust pipe side flange formed on the exhaust pipe is connected to this main body side flange through a heat insulating material. It will be.

[0013]

[Action]

 In the active silencer of the present invention, the silencer body is formed by connecting the body side flange formed on both end plates of the silencer body and the exhaust pipe side flange formed on the exhaust pipe via a heat insulating material. The body and the exhaust pipe are connected.

[0014]

【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 the active silencer of the present invention, in which reference numeral 51 denotes a silencer body.

The muffler body 51 is formed of a tubular member 53 having an elliptical cross section and end plates 55 arranged at both ends of the tubular member 53. Then, both ends of the tubular member 53 and the outer periphery of the end plate 55 are firmly joined by a well-known winding-molding process.

The both end plates 55 are each formed with a rectangular connection port 55a. A tubular edge portion 57 is formed so as to project outward from the connection port 55a, and a main body side flange 59 is formed at the open end of the tubular edge portion 57.

A partition wall 61 is arranged in a rectangular cross section between the connection port 55a of the end plate 55 on one side and the connection port 55a of the end plate 55 on the other side. Both ends of the partition wall 61 are fixed to the inner edge of the connection port 55a of the end plate 55 by welding or the like, and a silencing chamber 63 is formed inside the partition wall 61.

A microphone 65 is arranged in the muffling chamber 63. An opening 61a is formed in each of the partition walls 61 arranged to face each other in the major axis direction of the tubular member 53, and a secondary sound source, for example, a speaker including a round speaker, is formed in the opening 61a. 67 is arranged.

A protective plate 69 for protecting the speaker 67 is arranged in the opening 61 a of the partition wall 61, and a large number of small holes 69 a are formed in the protective plate 69. An exhaust pipe 71 that circulates the exhaust gas G is inserted through the central portion of the partition wall 61 arranged in a rectangular shape.

A large number of small holes 71 a are formed in the exhaust pipe 71. A rectangular spacer 73 made of a heat insulating material is fitted on both ends of the exhaust pipe 71, and the outer periphery of the spacer 73 is supported inside a tubular edge 57 formed on the end plate 55.

A sound absorbing material 77 made of, for example, glass wool is disposed in the muffling room 63 and the speaker room 75. An interference blocking plate 79 for blocking interference with the sound absorbing material 77 is arranged outside the speaker 67, and the interference blocking plate 79 is formed with a large number of small holes 79a.

A main exhaust pipe 81 is arranged in front of the end plate 55 of the silencer body 51, and an exhaust pipe side flange 81 a is fixed to the open end of the main exhaust pipe 81 by welding. The exhaust pipe side flange 81 a is connected to the main body side flange 59 formed on the tubular edge portion 57 of the end plate 55 via a heat insulating material 83 by a plurality of bolts 85 and nuts 87.

Further, a tail pipe 89 is arranged behind the end plate 55 of the silencer body 51, and an exhaust pipe side flange 81a is fixed to an opening end of the tail pipe 89 on the end plate 55 side. There is.

The exhaust pipe side flange 81 a is connected to the main body side flange 59 formed on the tubular edge portion 57 of the end plate 55 with a plurality of bolts 85 and nuts 87 via a heat insulating material 83. .

In the active silencer described above, noise of the exhaust gas G is detected by the microphone 65, and a cancel sound having a phase opposite to that of the noise is emitted from the speaker 67, so-called active silence is performed. .

In the above-described active silencer, however, a cylindrical shape is formed by projecting outward from the connection port 55a to the connection port 55a formed on both end plates 55 of the silencer body 51 in which the speaker 67 is housed. An edge 57 is formed, and a main body side flange 59 is formed at the open end of the tubular edge 57, and an exhaust pipe side flange formed on the main exhaust pipe 81 and the tail pipe 89 is formed on the main body side flange 59. Since 81a is connected through the heat insulating material 83, the silencer body 51 can be reliably connected to the main exhaust pipe 81 and the tail pipe 89 without dividing the silencer body 51.

That is, in the above-described active silencer, the main body side flange 59 formed on both end plates 55 of the silencer main body 51 and the exhaust pipe side flange 81a formed on the main exhaust pipe 81 and the tail pipe 89 are provided. Since the silencer main body 51 can be connected to the main exhaust pipe 81 and the tail pipe 89 by connecting the bolt 85 and the nut 87 via the heat insulating material 83, the silencer main body and the main exhaust pipe can be connected to each other. It is possible to firmly connect with the tail pipe.

Further, since the silencer body is not divided into a plurality of pieces along the axial direction unlike the conventional case, the cylindrical member 53 of the silencer body 51 and the both end plates 55 are joined by winding molding. This makes it possible to easily secure the strength of the silencer main body 51.

FIG. 3 shows a second embodiment of the active silencer of the present invention. In this embodiment, the partition wall 61 formed in a rectangular shape has a rectangular shape formed in the end plate 55. It projects from the connection port 55a, and a cylindrical edge 57 is formed by this projection.

The partition wall 61 is fixed to the connection port 55 a of the end plate 55 by welding. Also in the above-mentioned active silencer, it is possible to obtain substantially the same effect as that of the first embodiment.

FIG. 4 shows a third embodiment of the active silencer of the present invention. In this embodiment, the main body side flange 59 formed on the tubular edge 57 is located on the main exhaust pipe 81 side. Alternatively, the main exhaust pipe 81 and the exhaust pipe side flange 81a formed on the tail pipe 89 are formed to be inclined toward the tail pipe 89 side, and are formed to be inclined corresponding to the main body side flange 59. .

The main body side flange 59 is connected to the exhaust pipe side flange 81 a via a heat insulating material 83 by a rivet 91. The above-described active silencer can also obtain substantially the same effect as that of the first embodiment, but in this embodiment, since the main body side flange 59 and the exhaust pipe side flange 81a are formed to be inclined, When the flanges 59 and 81a are connected, the end plate 55 does not get in the way, and the connection with the rivet 91 or the like can be easily performed.

[0033]

[Effect of device]

 As described above, in the active muffler of the present invention, the cylindrical edge is projected outward from the connection port formed on both end plates of the muffler body in which the secondary sound source is housed. In addition to forming it, a main body side flange was formed at the open end of this tubular edge, and the exhaust pipe side flange formed on the exhaust pipe was connected to this main body side flange via a heat insulating material. There is an advantage that the silencer body and the exhaust pipe can be reliably connected without dividing the body.

[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 cross-sectional view showing an example of a conventional active silencer.

FIG. 6 is a cross-sectional view showing another example of an active silencer.

FIG. 7 is a front view of FIG.

[Explanation of symbols]

 51 Muffler Main Body 55 End Plate 55a Connection Port 57 Cylindrical Edge 59 Main Body Side Flange 67 Speaker 81 Main Exhaust Pipe 81a Exhaust Pipe Side Flange 83 Insulation Material 89 Tail Pipe

Claims (1)

[Scope of utility model registration request] 1. A connection port (55) formed in both end plates (55) of a silencer body (51) in which a secondary sound source (67) is housed.
In (a), a cylindrical edge portion (57) is formed by projecting outward from the connection port (55a), and the cylindrical edge portion (5) is formed.
A main body side flange (59) is formed at the open end of 7), and an exhaust pipe side flange (81a) formed in the exhaust pipe (81, 89) is attached to the main body side flange (59) with a heat insulating material (8).
An active silencer characterized by being connected via 3).