JPH0694181A - Noise suppressing pipe - Google Patents

Abstract

PURPOSE:To reduce the flow noise of water flowing through a pipe by covering the external surface of a hard resin pipe as a most inner pipe by a metal pipe through a middle layer, and constituting a middle layer with inorganic substance- containing layer such as inorganic substance fiber, etc., and hard material such as foam resin sheet, etc. CONSTITUTION:A hard layer 3 is applied around a hard resin pipe 1 made of hard vinyl chloride, polyethylene, etc., and an inorganic substance-containing layer 4 is applied on it. An article with such layers is inserted into a metal pipe such as a stainless steel, etc., and the metal pipe 1 is drawn to reduce its inner diameter and integrate it with the article. Accordingly, a desired noise suppressing pipe can be obtained. In this case, the hard layer 3 is formed with spirally wound foam resin sheet or non-foam flexible sheet, for example, in tape form, and the inorganic substance-containing layer 4 is formed with a sheet or tape made by the solidification of the linear or powder inorganic substance such as lead, iron, rock, glass, etc., with soft resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound deadening pipe. The sound deadening pipe means a pipe having a property of eliminating noise. It is, for example, a pipe that can be used as a drainage vertical pipe, and when the wastewater is poured into the pipe to drop the wastewater, the noise of the generated water is attenuated or eliminated, and the water can be gently drained. is there.

[0002]

2. Description of the Related Art In old buildings, cast iron pipes were used for drainage. However, cast iron pipes have drawbacks such as poor flow of water and heavy construction which makes it difficult to construct and the weight of the building cannot be reduced. Therefore, instead of a cast iron pipe, a hard synthetic resin pipe or a steel pipe lined with a hard vinyl chloride resin has been used for drainage. A hard vinyl chloride resin tube was often used as the hard synthetic resin tube.

However, a steel pipe lined with a hard synthetic resin pipe or a hard vinyl chloride resin is used as a drainage vertical pipe, and when the wastewater is dropped into the pipe, the sound of the wastewater flowing sounds to the outside. I showed the drawback. for that reason,
In the condominium, it is requested to refrain from drainage at night,
Occasionally, midnight drainage was banned. Thus, having to refrain from drainage at night is a pain for people living in an apartment. Therefore, the emergence of a drainage pipe, that is, a sound deadening pipe, in which the drainage sound does not reverberate outside has been demanded.

Attempts to attenuate the drainage noise have already been made in existing piping. For example, it was attempted to surround the existing drainage pipe made of hard vinyl chloride resin with glass wool to attenuate the drainage sound. However, this did not provide a sufficient silencing effect. Therefore, a lead plate was wound instead of glass wool. However, with existing resin pipes, there are some places where the lead plate is difficult to wind, and noise prevention tends to be inadequate at places where it is difficult to wind. I couldn't.

Recently, various materials have been provided as sound deadening materials in place of lead plates. For example, resin sheets containing lead fibers, iron oxide powder, and resin sheets containing rock powder have been provided as sound deadening materials. Therefore, it was attempted to obtain a sound deadening effect by winding these sound deadening materials around an existing resin drain pipe or the like. However, the trial was not easy to carry out and did not provide a sufficient silencing effect, as described for the lead plate. Moreover, the attempt was made only for the existing drain pipe, not for the pipe before the pipe.

The lead-fiber-containing resin sheet provided as a sound deadening material is made of lead as a thin lead thread, and the lead thread is irregularly arranged on a plane to form a non-woven fabric. It is sandwiched between and is integrated into a sandwich. The iron oxide powder-containing resin sheet provided as a sound deadening material is obtained by kneading a large amount of iron oxide powder with a soft vinyl chloride resin to form a sheet, and adding a reinforcing material to the sheet. An organic or inorganic fiber is used as the reinforcing material, and a material such as cloth is attached to one surface to form the reinforcing material. The rock powder-containing resin sheet provided as a sound deadening material is, for example, a barite powder, that is, barium sulfate powder, in place of the above-mentioned iron oxide powder. When such a sound deadening material was wound around a drainage pipe of a synthetic resin pipe, a certain level of sound deadening effect was obtained.

However, winding the above-mentioned sound deadening material into a sound deadening pipe has been performed only for existing piping. The reason is that in order to muffle the existing pipe, it is possible to wind a suitable muffling material around the pipe according to the existing site and leave the muffling material exposed. This is because that is not enough when it is offered as. That is, it has to look good and has to be in a form suitable for storage, transportation, connection, etc., but this is not easy. For this reason, although it has been known that a muffling material can provide a muffling effect, no attempt has been made so far to provide it as a muffling pipe.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sound deadening pipe so that the sound deadening effect can be obtained only by connecting the pipe.

[0009]

DISCLOSURE OF THE INVENTION The inventor of the present invention has wound a sound deadening material around a synthetic resin pipe, inserts the obtained wound product into a stainless pipe, and pulls out the stainless pipe to form an integrated composite. I tried to make it into a tube. Then, in the obtained composite pipe, the synthetic resin pipe and the stainless pipe are integrated with the soundproof material sandwiched between them, so that they are not easily separated, and since the stainless pipe is located on the surface, It was found that it would be convenient to handle. In addition, in that case, it was found that a metal tube made of iron, aluminum or the like can be used instead of the stainless tube.

Further, the present inventor only uses a sound deadening material containing fibers or powder of an inorganic material having a large specific gravity such as lead fiber, iron oxide, barite, etc. I found it difficult to do. Then, a foam resin sheet made of polystyrene, polyurethane or the like is laminated on the above-mentioned sound deadening material, and a two-layered one is interposed between the above-mentioned hard resin tube and metal tube to form a pipe.
Then, it has been found that it becomes easy to integrate the whole by drawing the metal pipe, the sound deadening property is improved, and a pipe that is easy to handle is easily obtained. It was also found that similar results can be obtained by using a non-foamed soft vinyl chloride resin sheet or paper instead of the above foamed resin sheet. The present invention has been completed based on such knowledge.

The present invention is a pipe in which an intermediate layer is interposed between a hard resin pipe forming the inner surface and a metal pipe forming the outer surface to reduce the inner diameter of the metal pipe, and the pipe is integrated. The intermediate layer is composed of at least two layers, one of which is an inorganic-containing layer and the other is a soft layer, and the inorganic-containing layer is an average specific gravity obtained by solidifying an inorganic fiber or powder having a specific gravity of 3 or more with a resin. The present invention provides a sound deadening pipe characterized in that the soft layer is composed of a foamed resin sheet or a non-foamed flexible sheet.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENT An example of the silencing pipe according to the present invention will be described with reference to the drawings as follows. FIG. 1 is a partially cutaway perspective view of a sound deadening pipe according to the present invention, and FIG. 2 is a partially cutaway perspective view of another sound deadening pipe according to the present invention.

As shown in FIG. 1, the sound deadening pipe according to the present invention is provided with a soft layer 3 around a hard resin pipe 1 and an inorganic substance-containing layer 4 thereon, and the wound product thus obtained. The metal tube 1 is inserted into the metal tube 1, and the metal tube 1 is drawn out to reduce the inner diameter, and the whole is integrated. Further, in the sound deadening pipe according to the present invention, the order of the soft layer 3 and the inorganic substance-containing layer 4 is changed, and the inorganic substance-containing layer 4 is provided around the hard resin pipe 1 as shown in FIG. The soft layer 3 is provided,
The wound product obtained in this manner may be inserted into the metal tube 1 and subjected to a drawing process so that the whole is integrated.

As the hard resin pipe 1, one that has been used as a drainage pipe up to now is used as it is or with a smaller thickness than that. As the material, hard vinyl chloride, polyethylene, polypropylene, polybutene, etc. can be used. The hard resin pipe 1 has a slightly different thickness depending on the material thereof, but the pipe in which the drainage noise is a problem usually has a nominal diameter in the range of 40 mm to 150 mm. The thickness of the tube changes only with the size of the nominal diameter, not with the material. Its thickness is in the range of 1.8 to 9.5 mm.

The soft layer 3 is formed of a foamed resin sheet or a non-foamed flexible sheet. Among them, the foamed resin sheet is made of, for example, polyurethane, polystyrene, polyolefin, rubber or the like, and is foamed into a sheet. In this case, either polyethylene or polypropylene can be used as the polyolefin, and natural rubber or synthetic rubber can be used as the rubber. There is no particular limitation on the expansion ratio or the size of the cells. As a commercially available product, a product sold as a sponge tape by Sekisui Chemical Co., Ltd. can be used as it is. The cells may be closed cells or open cells, but preferably open cells.

As the non-foamed flexible sheet forming the soft layer 3, various ones can be used. For example, a soft vinyl chloride resin sheet, a polyethylene sheet, an ethylene / vinyl acetate copolymer sheet, a rubber sheet, paper, cloth, etc. The flexible sheet is, in short,
Flexibility that can be wound around the hard resin tube 1,
It is necessary that the pressed portion has the property of being easily dented and deformable when strongly pressed in the thickness direction of the sheet. As the rubber, natural rubber or synthetic rubber can be used.

As shown in FIG. 1, the soft layer 3 may be spirally wound in the form of a tape, or as shown in FIG. Good. The winding may be one layer or two or more layers.

The inorganic material-containing layer 4 may be made of various materials. Lead as an inorganic substance,
Generally, iron, iron oxide, rock, glass, etc. with a large specific gravity are used. The large specific gravity means that the specific gravity is 3 or more, usually 4 or more, and preferably 5 or more. The flexible inorganic material may be used in the form of a wire, but otherwise it is used in the form of a powder.
For example, lead can be used in a linear form and glass can be used in a linear form, but most of them are used in the form of powder.

When the inorganic substance is used in a linear form, particularly when it is used as a fine fiber, or when the inorganic substance is used in a powder form, it is solidified with a resin, particularly a soft resin, and used as a sheet or tape. In this case, it is necessary to increase the content ratio of the inorganic substance as much as possible. Usually, the proportion of inorganic substances is 50% by weight or more. The soft resin means that it is softer than the resin that constitutes the hard resin tube 1, and may be any resin that is soft enough to be wound around the hard resin tube 1. The soft resin refers to, for example, soft vinyl chloride resin, low density polyethylene, ethylene / vinyl acetate copolymer, synthetic rubber, natural rubber and the like. By including a large amount of the inorganic substance, the inorganic-containing sheet or tape has an average specific gravity of 2 or more.

Sheet-shaped sound deadening materials made of inorganic fibers are already on the market. In the present invention, such a sound deadening material can be used for forming the inorganic-containing layer. The sound deadening material on the market has a structure as shown in FIG. In FIG. 3, 51 is a fiber made of lead, and 52 is a sheet of soft vinyl chloride resin. The sound deadening material 5 shown in FIG. 3 is made by forming a lead fiber 51 into a non-woven fabric and sandwiching it between soft vinyl chloride resin sheets 52 to be integrated. Such a sound deadening material 5 is manufactured by Toray Industries, Inc.
It is sold under the product name of "C". Although the lead fiber 51 is a non-woven fabric in FIG. 3, the lead fiber 51 may be woven as warp and weft.

A sound deadening material in the form of a sheet made of inorganic powder is already on the market. In the present invention, such a sound deadening material can also be used for forming the inorganic material-containing layer. The sound deadening material on the market has a structure as shown in FIG. In FIG. 4, 53 is an inorganic powder having a large specific gravity, and 54 is a soft vinyl chloride resin film containing no inorganic powder or little if any.

One method for producing the sound deadening material 5 shown in FIG. 4 is to first make a soft vinyl chloride resin film 54, then disperse the inorganic powder 53 between the films 54, and then make a film 54. Is a method in which they are bonded together by heating or an adhesive. In this case, it is preferable that the inorganic powder is thinly coated with an adhesive or a resin in advance. In another method, first, a soft vinyl chloride resin and a large amount of inorganic powder are well kneaded and molded into a sheet. The sheet thus produced contains a large amount of inorganic powder and therefore has poor tensile strength. Therefore, a reinforcing material is attached to this sheet. A fiber or a non-woven fabric is used as the reinforcing material, which is attached to one or both sides of the sheet to form the sound deadening material 5. The sound deadening material 5 thus produced contains a large amount of inorganic powder, and as a result, has an average specific gravity of 2 or more.

As the sound deadening material shown in FIG. 4, the following materials are commercially available. One is sold by Plastec Co., Ltd. under the product name "Sound Sticker", and the other is sold by Nichias Co., Ltd. under the product name "Shear Sound Sheet". is there. It is said that the former uses a ferrous oxide powder having a specific gravity of 5.7 as an inorganic substance, a soft vinyl chloride resin as a resin, and a non-woven fabric as a reinforcing material attached thereto. The latter is said to use barite powder as an inorganic substance and a soft vinyl chloride resin as a resin. Barite is a barium sulfate as a main component and its specific gravity is 4.5, which is a compound having a large specific gravity among metal salts. In the present invention, these sound deadening materials can be used in the inorganic-containing layer.

Various materials can be used as the metal tube 2. For example, an iron-based metal tube, an aluminum-based metal tube, a copper-based metal tube, or the like can be used. As the iron-based metal tube, a drawn tube, an electric resistance welded tube, a steel tube such as a welded tube, and a stainless tube can be used. As the copper-based metal tube, a brass tube can be used in addition to the copper tube. Each of these metal tubes has advantages and disadvantages. Although it is difficult to reduce the inner diameter of the stainless steel pipe by drawing, it is possible to make it thin so as to make the sound deadening pipe lighter, less likely to corrode, and have a beautiful appearance.
Aluminum-based metal pipes are light in weight and can be easily reduced in internal diameter by drawing, but they have the drawback of being easily corroded by waste water. The copper-based metal tube has a drawback that it is easy to reduce the inner diameter but is easily corroded.

In order to make the silencing pipe according to the present invention,
After providing the intermediate layer consisting of the above-mentioned inorganic substance-containing layer and the soft layer around the hard resin pipe 1, this is inserted into the metal pipe, and in this state, the inner diameter of the metal pipe is reduced to be integrated. .
In order to reduce the inner diameter of the metal tube, it is suitable to perform the drawing process of the metal tube, but it is not limited to this. With drawing, the outer diameter of the metal pipe is reduced by forcing the metal pipe into a die with a hole diameter smaller than the outer diameter of the metal pipe.
Accordingly, the inner diameter of the metal tube is reduced. The drawing process is preferable because the inner diameter of the metal tube can be uniformly reduced. However, the inner diameter of the metal tube may be partially reduced and for this purpose the metal tube may be partially recessed.

Hard resin tube 1, soft layer 3, inorganic-containing layer 4
The respective thicknesses of the metal tube 2 and the metal tube 2 are as follows. As described above, the thickness of the hard resin pipe 1 is that which has been used as the drainage resin pipe as it is, or is made slightly thinner than this. Specifically, the resin tube 1 having an inner diameter of 40-150 mm and a thickness of 1.8-9.5 mm is used. When the soft layer 3 is directly provided on the resin pipe 1, for example, a polyurethane sponge tape having a thickness of 0.5 to 2.5 mm or a low density polyethylene tape having a thickness of 0.5 to 2 mm is shown in FIG. Like a spiral. Next, the inorganic-containing layer 4 is provided thereon, and the above-mentioned "soundproof material FC" or "sound seal" is wound around it to a thickness of 1-2 mm. Then, the wound product is put into the metal tube 2 and is drawn. As the metal tube 2, a stainless tube having a thickness of 0.3-1 mm, an aluminum tube having a thickness of 1.5-2 mm, or a steel tube having a thickness of 1-2 mm is used. In this way, the sound deadening pipe according to the present invention is integrated as a whole.

In the above description, the thickness has been described with reference to the state before the inner diameter of the metal tube is reduced. In the intermediate layer, the inorganic material-containing layer and the non-foaming flexible material do not greatly change the thickness even when pressure is applied from the outside, but the foamed resin layer greatly changes the thickness when pressure is applied from the outside. . Therefore, in the state where the inner diameter of the metal tube is reduced and the whole is integrated, the foamed resin layer becomes thin and the bubbles disappear,
In extreme cases it may look like paper. .

Further, in the above description, the intermediate layer has been described as being composed of the soft layer 3 and the inorganic substance-containing layer 4, but the intermediate layer may further include other layers. For example,
An adhesive layer may be included between the hard resin tube 1 and the foamed resin layer 3, and an adhesive layer may be included between the foamed resin layer 3 and the inorganic substance-containing layer 4. Further, the intermediate layer may include a layer of damping material.

[0029]

EFFECTS OF THE INVENTION The sound deadening pipe according to the present invention is integrated by interposing an intermediate layer between the hard resin pipe forming the inner surface and the metal pipe forming the outer surface to reduce the inner diameter of the metal pipe. Since it is made, the whole is solidly integrated and can be easily manufactured. The intermediate layer is composed of at least two layers, one of which is an inorganic-containing layer and the other is a soft layer, and the inorganic-containing layer contains fibers or powders having a specific gravity of 3 or more and has an average specific gravity of 2 Since the soft layer is made of a foamed resin sheet or a non-foamed flexible sheet, the soft layer suppresses the vibration of the hard resin pipe and exhibits a sound deadening effect. Even when the wastewater is passed into the pipe, the pipe does not generate much noise due to the flow of the wastewater. In particular, the inorganic-containing layer has the drawback of reflecting sound by itself, but since the soft layer is adjacent to it, it absorbs sound well and suppresses the vibration of the resin pipe, so any sound as a whole is good. It will be absorbed. Therefore, it is useful as a sound deadening pipe. Furthermore, since the soft layer is interposed between the metal pipe and the hard resin pipe, there is no risk of damaging the hard resin pipe even if the inner diameter of the metal pipe is reduced too much, so that the whole is easily and surely integrated. Therefore, the sound deadening pipe can be manufactured more easily. In addition, since the metal pipe is located on the surface, it has a good appearance and is resistant to fire and has high commercial value. In particular, when a stainless steel pipe is used as the metal pipe, the sound deadening pipe is less likely to corrode and has a beautiful appearance, so that the value is further increased. The present invention provides such benefits.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a sound deadening pipe according to the present invention.

FIG. 2 is a partially cutaway perspective view of another silencing pipe according to the present invention.

FIG. 3 is a partially cutaway perspective view of a soundproof material that can be used to form an inorganic-containing layer in the present invention.

FIG. 4 is a partially cutaway perspective view of another soundproof material that can be used to form an inorganic-containing layer in the present invention.

[Explanation of symbols]

 1 Hard Resin Tube 2 Metal Tube 3 Soft Layer 4 Inorganic Material-Containing Layer 5 Sound Absorbing Material

Claims (1)

[Claims] 1. A pipe integrated by interposing an intermediate layer between a hard resin pipe forming an inner surface and a metal pipe forming an outer surface to reduce the inner diameter of the metal pipe, wherein the intermediate layer At least two layers, one of which is an inorganic-containing layer and the other of which is a soft layer, and the inorganic-containing layer has an average specific gravity of 2 or more obtained by solidifying an inorganic fiber or powder having a specific gravity of 3 or more with a resin. And a soft layer made of a foamed resin sheet or a non-foamed flexible sheet.