JPH02168097A - Muffling pipe - Google Patents

Abstract

PURPOSE:To effectively isolate noise generated from the interior of a pipe by a method wherein, in a muffling pipe for a blast pipe, a ventilating pipe, an engine exhaust gas pipe, a reflection absorbing plate in a corrugated cylinder is disposed in a gap between an inner and an outer pipe. CONSTITUTION:A muffling pipe forms double pipe structure formed with inner and outer pipes 1 and 2. A reflection absorbing plate 3 formed such that, for example, a paper, plastic, a composite material of them, or a metallic sheet is formed in a waveform shape by corrugate processing is disposed in a gap between the inner and outer pipes, and the gap is filled with a sound absorbing material 4, where necessary. In the inner and outer pipes 1 and 2, different pipes on a market may be used, and in the case of a pipe used for, for example, a duct, a flexible tube formed such that glass wool is covered with a polyvinyl chloride tube, and a flexible tube formed such that glass tarpaulin and a copper wire are processed in a spiral manner may be used. In any case, a gap between the inner and outer pipes 1 and 2 is increased to a value high enough to allow production of a sufficient muffling effect. This constitution enables production of a muffling effect through simple structure.

Description

[Detailed description of the invention] (Industrial application field) TECHNICAL FIELD This invention relates to a muffling pipe.

More specifically, the present invention relates to a noise-muffling pipe that is useful as a blower pipe, ventilation pipe, engine exhaust gas pipe, drainage pipe, etc., has excellent sound insulation effect from inside the pipe, and is easy to manufacture.

(Conventional technology and its issues) Traditionally, with regard to pipes such as blower pipes such as air conditioning air ducts, ventilation pipes, engine exhaust gas pipes, and drainage pipes, the sound generated inside the pipes is transmitted to the outside and becomes a noise source. Since then, various sound-reducing pipes have been proposed in which pipes are equipped with soundproofing mechanisms.

For example, soundproofing material wrapped around the outer wall of a pipe,
A pipe with a plate on the inner wall (Special Publication Publication No. 60-2)
7877), and a pipe in which an enlarged passage portion and a narrow passage portion are provided in the inner tube (Japanese Utility Model Application Publication No. 62-50387).

However, none of these have been widely used in practical use because either they do not provide a sufficient sound damping effect or their structures are complex and cannot be easily manufactured.

For this reason, even today, many buildings and condominiums still face noise problems caused by drainage and operation of air conditioners for heating and cooling at night.

This invention was made based on the above-mentioned circumstances, and provides a new sound-muffling pipe that has an excellent sound-damping effect, can effectively insulate the sound emitted from inside the pipe, and has a simple structure and can be easily manufactured. is intended to provide.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a double pipe consisting of an inner pipe and an outer pipe, in which a corrugated cylindrical reflection-absorbing plate is arranged in the gap between the inner and outer pipes. To provide a sound deadening pipe characterized by:

Embodiments of the present invention will be specifically described below with reference to the drawings.

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

As shown in FIG. 1, the sound deadening pipe of the present invention is
It has a double tube structure consisting of an inner tube (1) and an outer tube (2), and a corrugated cylindrical reflection-absorbing plate (3) is also arranged in the gap between the inner and outer tubes of the double tube. .

This kind of double pipe consisting of inner pipe (1) and piping (2) is
It can be easily manufactured using commercially available pipes of different diameters. In that case, the width of the gap between the inner tube (1) and the outer tube (2) should be set to a level that provides a sufficient sound deadening effect, since if it is too narrow, the sound insulation properties will be reduced.

In addition, the material of the pipe to be used can be adjusted as appropriate depending on the purpose of the sound-absorbing pipe and the installation environment, and the material of the inner pipe (1) and outer pipe (2) may be the same. It is also possible to use a different one.

For example, when using a noise-reducing pipe for a duct, the inner pipe (1) and outer pipe (2) of a double pipe are made of a flexible tube made of glass wool covered with a vinyl chloride tube, or a glass tarpaulin and steel wire that are spirally connected. A flexible tube formed by processing into a shape can be used. By using such a flexible tube, the pipe of the present invention can be made light in weight, and can also have good sound-deadening effect, heat insulation effect, and bending strength.

The corrugated cylindrical reflection-absorbing plate (3) is provided in the gap between the inside and outside of the double pipe to improve sound insulation between the inside and outside. As for the material of this corrugated cylindrical reflection/absorption plate (3), any corrugated material can be used without any particular restrictions. A molded product can be suitably used.

Such a reflection/absorption plate (3) may be provided in multiple layers within the gap between the inner and outer tubes, thereby further improving the sound deadening effect.

The shape of the wave of the reflection/absorption plate (3) is not particularly limited, and the bent portion may be formed as a curved surface (A) as shown in FIGS. 2(a) and (b). Good and
Alternatively, it may be formed as an acute angle part (B). In either case, it is preferable that the apex (a>(b) thereof be in contact with the surfaces of the inner and outer tubes. It is a sandwich structure with excellent strength. Become.

In addition, when particularly improving the sound deadening effect, a sound absorbing material (4) may be added to the gap between the inner tube (1) or the outer tube (2) and the reflection-absorbing plate (3) in the gap between the inner and outer tubes of the double tube. Filling is effective. As such a sound absorbing material (4), a fibrous material such as glass wool can be used.

As described above, the sound deadening pipe of the present invention can be manufactured extremely easily by inserting a corrugated cylindrical reflection-absorbing plate (3) into the gap between the inner and outer pipes, or by further filling the absorbing material (4) if necessary.・. Moreover, since lightweight materials can be used for all of its constituent materials, it can be made lightweight.

In addition, when manufacturing the sound-absorbing plate (3) in the axial direction of the pipe, as shown in FIG. A slit (5) may be made at right angles, and the reflection/absorption plate (3) with the slit inserted therein may be inserted between the inner tube (1) and the outer tube (2). In this case, the slit (5
) can be adjusted as appropriate depending on the degree of curvature required and the material of the reflection-absorbing plate (3).

(Effects of the invention) As described above in detail, the sound deadening pipe of this invention has the following features:
Since it can effectively muffle the sound generated inside the pipe and has a structure that can be easily manufactured, it becomes a practically useful sound-muffling pipe.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention. FIGS. 2(a) and 2(b) are partially enlarged sectional views thereof. FIG. 3 is a partially cutaway perspective view showing an example of the curved portion of the muffling pipe of the present invention. 1...Inner pipe 2...Outer pipe 3...Reflection-absorbing plate 4...Sound-absorbing material 5...Suri ・YTO agent Patent attorney Toshio Nishizawa Figures (a) (b)

Claims (3)

[Claims] (1) A sound deadening pipe characterized in that it is a double pipe consisting of an inner pipe and an outer pipe, and a corrugated cylindrical reflection-absorbing plate is arranged in the gap between the inner and outer pipes. (2) The muffling pipe according to claim (1), further comprising a multilayered wave-shaped cylindrical reflection-absorbing plate provided in the gap between the inner and outer tubes. (3) Claim (
1) Described sound deadening pipe.