JP2000104885A - Silencing pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a silencing pipe holding pipe strength and having sufficient sound insulating performance. SOLUTION: This pipe is a silencing pipe 1 constituted of an outer pipe 21 made of a synthetic resin and inner pipes 11 which are inscribed in the outer pipe 21 are made of an elastic resin body of 80 or below in hardness and have water flowing surfaces. The elastic resin body forming the inner pipes 11 is provided with hollow parts 31. A plurality of hollow parts 31 are arranged side by side along the circumferential directions of the inner pipes 11 and are arranged in the pipe shaft direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound-absorbing pipe suitably used for a water supply pipe or a drain pipe in a living space.

[0002]

2. Description of the Related Art Conventionally, in buildings such as houses, condominiums, and buildings, a water supply pipe and a drain pipe are provided inside the building. In particular, a large amount of flowing water is generated at one time in a drain pipe of a toilet or the like. Sanitary facilities such as toilets are often provided in or near living spaces. And a large amount of running water generates sound inside the pipe. The noise generated every time water flows from such a water supply / drain pipe impairs habitability, gives a resident discomfort, and impedes a quiet living environment. Therefore, there is a demand for reduction of these water supply and drainage sounds.

In view of this point, for example, Japanese Patent Application Laid-Open No. 63-23 / 1988
Japanese Patent No. 4298 discloses a technique of winding a sheet made of a resin composition filled with a high specific gravity fluid on the surface of a water supply / drain pipe. However, this one has poor flexibility and poor workability, and its sound insulation is not sufficient.

Further, Japanese Patent Publication No. 6-31657 discloses a plastic pipe having a high specific gravity by blending a barium sulfate type filler. According to this pipe, if the specific gravity per unit area is large, a sound insulating effect can be obtained. However, there is a problem in that the thickness of the pipe itself is increased and the cost is disadvantageous. In addition, the generation of sound due to flowing water is largely caused by solid vibration, and a rigid material does not have a sufficient sound insulation effect even if the weight is increased. Further, when a large amount of a filler is added to increase the specific gravity, there is a problem that the moldability is deteriorated and the physical properties of the obtained molded product are deteriorated.

Japanese Patent Application Laid-Open No. 6-174176 discloses that
There is disclosed a pipe joint cover which is composed of an outer shell formed from a material obtained by adding barium sulfate or the like to a vinyl chloride resin and an inner shell made of a foamed resin and divided into two in the axial direction. However, this thing, at the time of its construction,
Since the sound insulation cover split in the axial direction is put on the pipe joint and the sound insulation putty is packed in the seal part, workability is inferior.
It was also disadvantageous in terms of cost.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sound-absorbing pipe which solves the above-mentioned conventional problems, maintains the strength of the pipe, and has a sufficient sound insulation performance.

[0007]

According to a first aspect of the present invention, there is provided a sound deadening pipe comprising an outer pipe made of a synthetic resin and an elastic resin body inscribed in the outer pipe and having a hardness of 80 or less. A sound-absorbing pipe comprising an inner pipe having a flowing water surface, wherein a hollow portion is provided in an elastic resin body forming the inner pipe, and a plurality of hollow portions are provided in parallel along a circumferential direction of the inner pipe. , Arranged in the tube axis direction.

In the present invention, examples of the elastic resin include olefin-based thermoplastic elastomer (TPO), vinyl chloride-based thermoplastic elastomer (TPVC), urethane-based thermoplastic elastomer (TPU), and styrene-based thermoplastic elastomer (SBC). And ester-based thermoplastic elastomer (TPEE), amide-based thermoplastic elastomer (TPAE), etc., having a hardness of 80 or less. If the hardness exceeds 80, sufficient noise reduction performance cannot be obtained.

Here, the hardness is defined by JIS K6301.
A value measured according to the “Vulcanized Rubber Physical Test Method”.

[0010] As a method for producing the sound deadening pipe of the present invention, a two-layer integral extrusion molding method is possible. As a two-layer integral molding method, a two-layer simultaneous extrusion molding method, a method in which a pipe mold and a crosshead mold are used, and after the inner pipe is formed, a synthetic resin pipe is continuously coated therearound on the same molding line. Is used.

The sound-absorbing pipe according to the first aspect of the present invention has an effect of absorbing an impact generated when a fluid flows by an inner pipe made of an elastic resin and reducing a generated sound. Also, a hollow portion is provided in the elastic resin body forming the inner tube, and a plurality of the hollow portions are arranged in a line along the circumferential direction of the inner tube and are arranged in the tube axis direction. This suppresses the transmission of solid vibration when flowing water, and greatly reduces the sound generated from the outer wall of the pipe when flowing water. Further, the outer tube made of a synthetic resin blocks sound absorbed by the inner tube and maintains the shape of the tube. still,
Pipe molding can be performed in one line, and the production cost is more advantageous than layer-by-layer molding and coating. Further, at the time of construction, there is no need to perform the work of attaching the sound insulating material to the piping, and the workability is improved because the adhesive connection is possible and the sleeve diameter and the joint are performed as usual.

[0011]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of the sound deadening pipe of the present invention. As shown in FIG.
Is made of a synthetic resin and has a double pipe structure in which the inner pipe 11 is inscribed in the outer pipe 21. The inner tube 11 is formed of an elastic resin having a hardness of 80 or less, and the outer tube 21 is formed of a synthetic resin tube. The inner tube 11 is provided with a hollow portion 31 in an elastic resin body forming the inner tube. The hollow portions 31 have a circular cross-sectional shape, are arranged in parallel along the circumferential direction of the inner tube 11, and are arranged inside the elastic resin body in the tube axis direction.

FIG. 2 is a sectional view showing another example of the sound deadening pipe of the present invention. As shown in FIG.
Is made of a synthetic resin, and has an inner tube 12 inserted into an outer tube 22 to form a double tube structure. The inner tube 12 is formed of an elastic resin having a hardness of 80 or less, and the outer tube 22 is formed of a synthetic resin tube. In the inner tube 12, a hollow portion 32 is provided in an elastic resin body forming the inner tube. The hollow portions 32 have a rectangular cross-sectional shape, are arranged in plural numbers along the circumferential direction of the inner tube 12, and are arranged in the elastic resin body in the tube axis direction.

FIG. 3 is a sectional view showing still another example of the sound deadening pipe of the present invention. As shown in FIG. 3, the sound deadening pipe 3 is made of a synthetic resin and has a two-layer structure including an inner pipe 13 and an outer pipe 23. The inner tube 13 is formed of an elastic resin having a hardness of 80 or less, and the outer tube 23 is formed of a synthetic resin tube. In the inner tube 13, a hollow portion 33 is provided in an elastic resin body forming the inner tube. The hollow portion 33 has a rectangular cross-sectional shape, is arranged in a plurality along the circumferential direction of the inner tube 13, and is arranged in the tube axis direction with one side of the hollow portion in contact with the inner circumferential surface 23 a of the outer tube 23. Have been.

FIG. 4 is a sectional view showing still another example of the sound deadening pipe of the present invention. As shown in FIG. 4, the sound deadening pipe 4 is made of synthetic resin and has a two-layer structure including an inner pipe 14 and an outer pipe 24. The inner tube 14 is formed of an elastic resin having a hardness of 80 or less, and the outer tube 24 is formed of a synthetic resin tube. In the inner tube 14, a hollow portion 34 is provided in an elastic resin body forming the inner tube. The hollow portion 34 has a triangular cross-sectional shape, is arranged in a plurality along the circumferential direction of the inner tube 14, and has one side of the hollow portion in contact with the inner circumferential surface 24 a of the outer tube 24 and is arranged in the tube axis direction. Have been.

When a fluid is caused to flow down into the pipes of the sound-absorbing pipes 1 to 4, the inner pipes 11 to 14 molded from an elastic resin having a hardness of 80 or less absorb an impact generated when the fluid flows, The generated sound is reduced. The air layers of the hollow portions 31 to 34 provided inside the elastic resin bodies of the inner tubes 11 to 14 have a sound absorbing effect. The transmission of the solid vibration at the time of flowing water is suppressed by the hollow walls of the hollow portions 31 to 34, and the inner pipes 11 to 14 greatly reduce the sound generated at the time of flowing water. The outer tubes 21 to 24 made of a synthetic resin cut off the sound absorbed by the inner tubes 11 to 14 and maintain the shape of the tubes.

The present invention will be described below with reference to examples. The measurement of the sound insulation effect was performed by the following method. A sound-absorbing pipe with an outer diameter of 89 mm is molded and penetrated into a reverberation room surrounded by soundproof walls. Then, the sound generated in the reverberation chamber was measured. The height of the reverberation room was 2 m, and the measurement was performed at a position 50 cm away from the outer surface of the bipe, and a microphone was installed at the center height in the reverberation room. Table 1 shows the results. In the column of the sound insulation effect in Table 1, 6 was detected when piping was performed using a polyvinyl chloride resin pipe.
The difference from 5 dB was shown.

Examples of the inner tube material are shown in Examples 1 to 6 and Comparative Examples 1 to 4 are shown in Table 1. In addition, the thing of the structure shown in FIG. The outer tube 21 made of synthetic resin is made of vinyl chloride resin (manufactured by Tokuyama Sekisui Co., Ltd.
100 parts by weight of trade name TS-1000R) and octyltin mercapto (manufactured by Sankyoki, trade name ONZ-142F) 2
Parts by weight and a lubricant (trade name: Hiwax, manufactured by Mitsui Petrochemical Co., Ltd.)
It was molded using a resin composition consisting of 1 part by weight of 220MP) and 1 part by weight of Sakura stearic acid (manufactured by NOF Corporation).

The inner tube 11 made of an elastic resin body is made of Mitsubishi Chemical MKV's S2020, FB40DA, and Zeon Chemical's SE.
1064 and SE5401 are used.

[0018]

[Table 1]

As is clear from Table 1, all of the examples of the present invention have a better sound insulation effect than the comparative example.

Next, Examples 7 to 10 are shown in Table 2. still,
The silencing pipe has an outer diameter of 89 mm and has a structure shown in FIGS. In Table 2, 100 parts by weight of vinyl chloride resin (TS-1000R manufactured by Tokuyama Sekisui Kogyo Co., Ltd.), 2 parts by weight of octyltin mercapto (ONZ-142F manufactured by Sankyo Co., Ltd.) were used for the outer tubes 21 to 24 made of synthetic resin. The lubricant was molded using a resin composition comprising 1 part by weight of Hiwax 220MP manufactured by Mitsui Petrochemical and 1 part by weight of Sakura Stearic Acid manufactured by NOF Corporation. The elastic resin used for the inner tubes 11 to 14 is FB40DA manufactured by Mitsubishi Chemical MKV.

[0021]

[Table 2]

As is clear from Table 2, in the case of the embodiment of the present invention, any shape of the hollow portion has a high sound insulation effect.

[0023]

As described above, the sound-absorbing pipe of the present invention maintains the strength of the pipe and has sufficient sound insulation performance.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one example of a sound deadening pipe of the present invention.

FIG. 2 is a sectional view showing another example of the sound deadening pipe of the present invention.

FIG. 3 is a sectional view showing still another example of the sound deadening pipe of the present invention.

FIG. 4 is a sectional view showing still another example of the sound deadening pipe of the present invention.

[Explanation of symbols]

 1, 2, 3, 4 Sound-absorbing pipes 11, 12, 13, 14 Inner pipes 21, 22, 23, 24 Outer pipes 31, 32, 33, 34 Hollow parts 23a, 24a Inner peripheral surface of outer pipe

Claims (1)

[Claims] 1. A sound-deadening pipe comprising: an outer pipe made of a synthetic resin; and an inner pipe insulated by the outer pipe and made of an elastic resin body having a hardness of 80 or less and having a flowing water surface. A sound-absorbing pipe, wherein a hollow portion is provided in the elastic resin body forming the inner tube, and a plurality of the hollow portions are arranged in a line along the circumferential direction of the inner tube and are arranged in the tube axis direction. .