JP2007322043A - Sound absorpbing pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound absorpbing pipe of low ventilation resistance. <P>SOLUTION: A step portion 11 applying a part of a ventilation flue 7 as a large-diameter portion 10 is formed on a pipe 8 disposed in a hole 4 penetrating through a wall 1 and defining the ventilation flue 7 communicating indoors 2 and outdoors 3, and a sound absorbing material 12 is disposed on the step portion 11, thus the noise intruding from outdoors 3 can be reduced, and ventilation resistance of the ventilation flue 7 can be reduced as its inner peripheral face is made flush by the sound absorbing material 12 even at the step portion 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pipe provided on a wall so as to communicate between the room and the outdoors.

  In recent years, the importance of ventilation has been increasing, and it has become widespread to install ventilation devices on walls. However, if there is noise on the main road, railway, factory, etc. in the vicinity, there is an intrusion of noise through the ventilator, so it is desirable to take measures against noise absorption by the ventilator.

  2. Description of the Related Art Conventionally, an apparatus for absorbing sound of this type is known that is provided in a pipe that communicates the indoor side and the outdoor side (for example, see Patent Document 1).

  The configuration will be described below with reference to FIG.

As shown in the figure, a sound absorbing device 105 is inserted into a pipe 104 that forms a ventilation path communicating with an indoor 102 and an outdoor 103 on a wall 101, a ventilation port 106 is inserted on the indoor side, and a pipe hood on the outdoor side. 107 was inserted.
JP 2003-28346 A ([0009], [0010], FIG. 1)

  In such a conventional sound absorbing device, there is a problem that the ventilation resistance is reduced by providing the pipe in the ventilation path of the pipe and the ventilation amount is reduced.

  The present invention solves the above-described problems, and an object thereof is to provide a sound absorbing device having low ventilation resistance.

  In order to achieve the above object, the sound absorbing pipe of the present invention is provided in a hole penetrating the wall to form a ventilation path that communicates between the room and the outside, a ventilation device is inserted into the room side, and a pipe hood is placed outside the room. In the tubular pipe to be inserted, a step portion having a part of the ventilation path as a large diameter portion is formed, and a sound absorbing material is provided in the step portion.

  Another means is that flanges are formed at both ends of the pipe.

  According to the present invention, it is possible to provide a sound absorbing device that exhibits a sound absorbing effect even when the ventilation resistance is low.

  Moreover, workability becomes easy.

  The sound absorbing pipe according to claim 1 of the present invention is a cylindrical pipe in which a step portion having a part of the ventilation path as a large diameter portion is formed and a sound absorbing material is provided in the step portion. Even if the material is provided in the pipe, there is no obstacle to ventilation in the ventilation path in the pipe, so that the ventilation resistance in the pipe is lowered.

  The sound-absorbing pipe according to claim 2 of the present invention is such that flange portions are formed at both ends of the pipe, and has an effect that the workability becomes easy.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

(Embodiment 1)
As shown in FIGS. 1 and 2, a pipe 8 is inserted into a hole 4 penetrating the wall 1 so as to form an air passage 7 that communicates the room 2 with the outdoor 3. On the inner peripheral side of the pipe 8, a large-diameter portion 10 is provided which has a partly large inner diameter and forms a step portion 11 with other inner diameter portions. The step portion 11 is provided so as to be filled with the sound absorbing material 12 so that the sound absorbing material 12 and the inner peripheral surface of the pipe 8 are flush with each other. Moreover, the ventilation apparatus 5 is inserted in the indoor side of the pipe 8, and the pipe hood 6 is inserted in the outdoor side.

  In the above configuration, when the ventilator is operated, the air in the room 2 is exhausted from the pipe hood 6 to the outdoor 3 through the ventilation path 7 of the pipe 8, but at this time, the step portion 11 is formed on the inner peripheral surface of the pipe 8. However, the sound absorbing material 12 makes the inner peripheral surface flush with the stepped portion 11, and the ventilation resistance can be lowered. And the noise which permeates from the outdoor through the pipe hood 6 and the ventilation path 7 of the pipe 8 is absorbed by the sound absorbing material 12 and attenuated.

(Embodiment 2)
As shown in FIGS. 3 and 4, the second embodiment is characterized in that flange portions 14 are formed at both end portions 13 of the pipe 8A.

  In the above configuration, one flange portion 14 of the pipe 8A is brought into contact with and temporarily fixed to the inner surface of the outer wall 15 to be constructed first in the wall 1, and then the inner wall surface 16 is fixed to the other flange portion 14. Install it so that it abuts.

  In this way, by installing and installing the sound absorbing pipe, the mounting position of the pipe 8A can be determined easily and reliably, and the workability becomes easy.

  The sound absorbing pipe according to the present invention is useful for reducing outdoor noise that enters through various devices attached to a pipe provided in a hole penetrating a wall.

Sectional drawing which shows the sound absorption pipe of Embodiment 1 of this invention Perspective view of the sound absorbing pipe Sectional drawing which shows the sound absorption pipe of Embodiment 2 of this invention Perspective view of the sound absorbing pipe Sectional view of a conventional sound absorber

Explanation of symbols

1 Wall 2 Indoor 3 Outdoor 4 Hole 5 Ventilator 6 Pipe Hood 7 Ventilation Path 8, 8A Pipe 10 Large Diameter Part 11 Stepped Part 12 Sound Absorbing Material 13 Both Ends 14 Flange Part

Claims (2)

A cylindrical pipe that is provided in a hole penetrating the wall to form a ventilation path that communicates between the inside and outside of the room, a ventilation device is inserted into the room, and a pipe hood is inserted into the outside of the room. A sound absorbing pipe, wherein a step portion having a large diameter portion is formed, and a sound absorbing material is provided in the step portion. The sound absorbing pipe according to claim 1, wherein flanges are formed at both ends of the pipe.

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