WO2000017563A1 - Soundproof cover for pipes - Google Patents

Abstract

A soundproof cover provided with a soundproof layer and applied to pipes of a plumbing system and an air-conditioner for buildings, characterized by comprising a sound absorption film provided on an inner surface of the soundproof layer and a spacer mounted on an outer side of the sound absorption film, the spacer being adapted to secure a space between the sound absorption film and a pipe when the soundproof cover is fitted around the pipe, thus enabling the weight of the soundproof cover to be reduced, the handling efficiency thereof to be improved, and the soundproofing performance thereof to be also improved.

Description

Technical Field The present invention relates to a soundproof cover having a soundproof layer applied to a pipe of a building water supply / drainage device or an air conditioner. More specifically, the present invention relates to a soundproof cover for piping having light weight, excellent handleability, and excellent soundproof performance. Keiki In recent years, as indoor environments and comfort of living spaces are increasingly required, noise measures have been greatly improved, and rational and reliable soundproofing of plumbing and drainage noise has become an issue among industries. Development is underway. To respond to such demands, we have proposed a sound insulation layer composed of an air-cushion sheet, glass wool, felt, and other sound-absorbing layers laminated on a sound insulation layer made of asphalt-based sheet. There is a soundproof cover for piping. However, in order to obtain a sufficient soundproofing effect in the above-described soundproofing cover for piping, a method of increasing the surface density of the soundproofing layer or increasing the thickness of the sound absorbing layer has been adopted. Was. For example by increasing the surface density of the sound insulation layer, if an attempt'll ensure sufficient soundproofing effect, 5. 0~1 0. O kg / m 2 must be a high surface density such, this case, the The weight of the soundproof cover also increases, making it difficult to handle. In addition, when the soundproof cover is attached to the pipe surface, the soundproof cover is heavy, and if the soundproof cover drips or peels off, a malfunction may occur. On the other hand, when the method of increasing the thickness of the sound absorbing layer is used, a sufficient soundproofing effect is obtained. Requires a thickness of 10.0 to 20. O mm, and becomes bulky.As a result, when the soundproof cover is attached to the peripheral surface of the piping, the piping is placed in the space of the factory. There is a fear that a situation in which they cannot be arranged may occur. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a soundproof cover for piping that is lightweight, has excellent handleability, and has excellent soundproof performance. DISCLOSURE OF THE INVENTION In order to achieve the above object, according to the present invention, there is provided a soundproof cover provided with a soundproof layer applied to a plumbing system of a building water supply / drainage device or an air conditioner, wherein a sound absorbing film is provided on an inner surface of the cover. When a spacer is attached to the outside of the pipe and the force bar is attached around the pipe, the spacer is used to secure a space between the sound absorbing film and the pipe. The gist is a soundproof cover for piping (hereinafter simply referred to as cover). As shown in FIG. 2, when the cover 11 is attached around the pipe 10 as shown in FIG. 2, a space is secured between the sound absorbing film 13 and the pipe 10 by the spacer 14. As a result, the sound absorbing film 13 has a non-contact portion that does not come into contact with the pipe 10, and this portion receives noise (sound energy) from the pipe 10 directly. It vibrates and absorbs and reduces effective noise (sound energy). BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a state where a cover of the present invention is attached to a pipe. FIG. 2 is an enlarged sectional view of a main part of a pipe to which the cover of FIG. 1 is attached.

Fig. 3 shows the sliding of the cover, leaving both ends to fit into the L pipe of the pipe (straight pipe). It is the perspective view which showed the example attached so that it was possible.

 FIG. 4 is a schematic diagram showing a dipole in the base material of the sound absorbing film on the inner surface of the cover of the present invention.

 FIG. 5 is a schematic diagram showing a state of a dipole in a base material of the sound absorbing film when vibration energy is applied.

 FIG. 6 is a schematic diagram showing a state of a dipole in a base material of a sound absorbing film when an active ingredient is blended.

 FIG. 7 is a graph showing the relationship between the frequency (H z) and the sound pressure level (dB A) of the pipe (500) according to Example 1, Comparative Example 1, and Comparative Example 3.

 FIG. 8 is a graph showing the relationship between the frequency (H z) and the sound pressure level (dB A) of the pipe (750) according to Example 2, Comparative Example 2, and Comparative Example 4.

FIG. 9 is a schematic diagram showing a device for measuring noise (sound pressure level) of each pipe of Examples 1 and 2 and Comparative Examples 1 to 4. BEST MODE FOR CARRYING OUT THE INVENTION The cover of the present invention is applied to a plumbing system of a building plumbing system or an air conditioner to efficiently absorb and mitigate noise (sound energy) generated from the plumbing. It is a soundproofing material for pipes that can provide sound insulation and create a comfortable indoor environment and living space. The cover 11 shown in FIGS. 1 and 2 is fitted so as to be fitted from one end of the pipe 10, has a soundproof layer 12, and has an inner surface thereof (the surface facing the pipe). A sound-absorbing film 13 is disposed on the outside, and a spacer 14 is attached to the outside of the sound-absorbing film 13 (on the piping side). The cover 11 shown in FIG. 1 and FIG. 2 is a tubular type which is fitted into the pipe 10 and fixed to the pipe 10; for example, it has a sheet shape. May be wound around the peripheral surface of the pipe 10 and fixed at the ends to be attached to the peripheral surface of the pipe 10. Examples of the soundproofing layer 12 constituting the cover 11 include a soundproofing layer, a vibration damping layer, a vibration damping layer and a sound absorbing layer, a sound insulating layer, a vibration damping layer and a sound absorbing layer, Examples thereof include a combination of a sound insulation layer, a vibration isolation layer, and a sound absorption layer, and a combination of a combination of a sound insulation layer and a sound absorption layer. The material, structure, shape, and the like of the material are completely arbitrary. The choice of material, structure, and shape should be determined as appropriate, taking into account the type and size of the piping to be applied, the required soundproofing performance, and other factors. The soundproof layer 12 shown in FIGS. 1 and 2 is a combination of the sound insulating layer 15 and the sound absorbing layer 16. The sound insulating layer 15 may be made of, for example, a vinyl chloride resin such as a vinyl chloride resin, a vinyl acetate-vinyl chloride copolymer, an ethylene-vinyl chloride copolymer, a vinylidene chloride-vinyl chloride copolymer, or an ethylene-acetic acid. Made of vinyl chloride resin such as vinyl chloride graft copolymer resin such as Bull monochloride graft copolymer, polyurethane monochloride graft copolymer, and calcium carbonate, talc, magnesium oxide, alumina, titanium oxide A preferable example is a material which is improved in sound insulation by filling with filler such as barium, iron oxide, zinc oxide, and graphite. The sound-absorbing layer 16 is made of a resin such as urethane, black lipene, styrene-butadiene copolymer, polyethylene, polypropylene, ethylene acetate butyl, or styrene, alone or in combination. In order to ensure this, an open cell structure (foam structure) can be suitably used. The foaming ratio in the case where the sound absorbing layer 16 has a foamed structure is preferably 10 to 50 times from the viewpoint of ensuring good sound absorbing properties. Further, the sound absorbing layer 16 may be subjected to a perforation process, a slit process, or the like in order to further enhance the sound absorbing property. Further, in addition to the sound insulating layer 15 and the sound absorbing layer 16, a vibration damping layer or a vibration damping layer may be combined as a part of the sound insulating layer 12. As the vibration damping layer, for example, Rubber such as acrylonitrile-butadiene rubber (NBR), styrene-butadiene rubber (SBR), butadiene rubber (BR), natural rubber (NR), isoprene rubber (IR), etc. is blended with the base resin and filled with filler. Thus, a preferable example of improvement in vibration damping can be given. The vibration isolating layer is mainly made of rubber-based materials such as acrylonitrile-butadiene rubber (NBR), styrene-butadiene rubber (SBR), butadiene rubber (BR), natural rubber (NR), and isoprene rubber (IR). And those obtained by blending a resin with these rubber-based materials. The vibration-proofing layer may be filled with a filler such as carbon black or calcium carbonate if necessary (for adjusting the hardness). The cover 11 of the present invention includes the above-described soundproof layer 12, and further includes an inner surface of the force bar 11, that is, an inner surface of the soundproof layer 12 (in this example, an inner surface of the sound absorbing layer 16). ), A sound absorbing film 13 is disposed. The material, structure, and shape of the sound absorbing film 13 are not particularly limited as long as it can receive noise (sound energy) from the pipe 10 and vibrate, and can absorb and mitigate the noise (sound energy). Particularly preferred is a film obtained by adding an active ingredient for increasing the amount of dipole moment to a base material constituting the sound absorbing film to form a film. Hereinafter, the sound absorbing film containing the active ingredient will be described in detail. As a base material constituting the sound absorbing film, for example, polyvinyl chloride, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polymethyl methacrylate, vinylidene polyfluoride, polyisoprene, polystyrene, styrene-butadiene-acrylonitrile copolymer Polymers such as polymers, styrene-acrylonitrile copolymer, acrylonitrile-butadiene rubber (NBR), styrene-butadiene rubber (SBR), butadiene rubber (BR), natural rubber (NR), and isoprene rubber (IR) A blend of these can be used. Among them, polychlorinated fly Is preferred because it has good moldability and is inexpensive. The present inventors have elucidated the following sound absorption mechanism through research on sound absorbing materials. Vibration is generated when noise (sound energy) collides with the base material of the sound absorbing film. At this time, as shown in FIG. 5, displacement occurs in the dipole 22 existing inside the base material 21. The displacement of the dipole 22 means that each dipole 22 inside the base material 21 rotates or its phase is shifted. It can be said that the arrangement state of the dipoles 22 inside the base material 21 before the sound energy is applied as shown in FIG. 4 is in a stable state. However, as shown in Fig. 5, when noise (sound energy) collides with the sound absorbing film and the sound energy is added, when the dipole 22 existing inside the base material 21 is displaced, Each dipole 2 2 inside the material 21 will be placed in an unstable state, and each dipole 2 2 will try to return to the stable state shown in FIG. At this time, energy is consumed. It is considered that the sound absorption effect is caused by the energy consumption due to the displacement of the dipole inside the base material and the restoring action of the dipole, and the energy consumption due to the generation of frictional heat on the surface of the base material. When considering the mechanism of such sound absorption, the sheet resistance per unit area of the base material and the amount of dipole moment inside the base material 21 as shown in FIGS. 4 and 5 are greatly involved in sound absorption. I understand. According to the experiments performed by the present inventors, the larger the amount of the dipole moment in the base material 21, the higher the performance (sound absorption) of the base material 21 in absorbing the sound energy. I understood that. The amount of the dipole moment in the above-described base material varies depending on the type of the polymer serving as the base material. Also, even if the same polymer is used as the base material, The amount of dipole moment generated in the base metal changes depending on the temperature and frequency of the sound when it is applied. The amount of dipole moment also changes depending on the magnitude of the sound energy applied to the base material. For this reason, it is desirable to select the polymer that has the largest amount of dipole moment in consideration of the temperature, sound frequency, energy level, etc. at the time of application, and use this as the base material. . However, when selecting a polymer as a base material, not only the amount of dipole moment in the base material, but also handleability, moldability, availability, temperature performance (heat resistance and cold resistance), weather resistance, price, etc. It is desirable to consider The active component contained in the base material is a component that dramatically increases the amount of dipole moment in the base material, and the active component itself has a large amount of dipole moment or the active component itself. Although the dipole moment is small, it means a component that can dramatically increase the dipole moment in the base material by blending the active component. For example, the amount of the dipole moment generated in the base material 21 under given temperature conditions, sound frequency, and energy level is the same as shown in Fig. 6 by adding the active ingredient to this. Under these conditions, the amount will increase by a factor of three or ten. Along with this, the energy consumption due to the dipole restoring action when the above-mentioned energy is added will also increase dramatically, and the sound absorption effect due to the friction of the base metal surface will be added, which will make prediction much more It is thought that an excessive sound absorption effect will occur. Examples of active ingredients that induce such effects include N, N-dicyclohexylbenzothiaziru 2-sulfenamide (DCHBSA), 2-mercaptobenzothiazole (MBT), dibenzothiazyl sulfide (MBTS), and the like. N-cyclohexyl benzothiazyl di-2-sulfenamide (CBS), N-tert-butyl benzothiazyl di-2-sulfenamide (BBS), N-oxyzet One or more selected from compounds containing a benzothiazyl group, such as lenbenzothiazyl-2-sulfenamide (OBS) and N, N-diisopropylbenzothiazyl-2-sulfenamide (DPBS); benzene 2- (2'-Hydroxy_3 ')-(3 ", A", 5 ", 6" tetrahydrophtalidamide methyl) with benzotriazole which has an azole group bonded to the ring as its mother nucleus 5'-Methylphenyl} benzotriazole (2 HPMMB), 2- {2'-hydroxyl 5'-methylphenyl) -benzotriazol (2HMPB), 2- {2 ' — 3'-t-butinole 1 5'-methinolephenone) 1 5—black benzotriazo mono (2 HBMP CB), 2-{2'—hide mouth 3 ', 5'—di t-Butylphenyl} 1-5-Venzotri One or more compounds selected from among compounds having a benzotriazole group such as azole (2HDBPCB), and a compound containing a diphenyl acrylate group such as ethyl-12-cyano-3,3-diphenylacrylate. One or two or more selected from the group consisting of 2-hydroxy-4-methoxybenzophenone (HMBP), 2-hydroxy4-methoxybenzophenone-15-sulfonic acid (HM One or more compounds selected from compounds having a benzophenone group such as (BPS). The content of the active ingredient is desirably 10 to 300 parts by weight based on 100 parts by weight of the base material. This is because if the content of the active ingredient is less than 10, the sufficient effect of dramatically increasing the amount of dipole moment in the base material cannot be obtained, and the content of the active ingredient is less than 300. If the content exceeds the above, even if the content is increased, an increase in the amount of dipole moment cannot be expected by the increased amount, and further, there is a fear that a problem that the formability is deteriorated may be caused. Incidentally, the amount of dipole moment in the above-mentioned active component varies depending on the type of active component similarly to the amount of dipole moment in the base material. Even when the same active ingredient is used, the amount of dipole moment generated in the base metal changes depending on the temperature when sound energy is applied. Also, the amount of dipole moment changes depending on the magnitude of the sound energy applied to the base material. For this reason, it is desirable to select and use the active component that gives the largest amount of dipole moment in consideration of the temperature and energy at the time of application. In deciding the active ingredient to be mixed in the base material, it is good to select the one with a similar value in consideration of the easiness of compatibility between the active ingredient and the polymer serving as the base material, that is, the SP value. . It is to be noted that, in addition to the base material and the above-mentioned active ingredient, a corrosion inhibitor, a dye, and the like can be added to the sound absorbing film as needed. In addition, a conventionally known method can be used as a molding method for blending the above components and molding the blend into a film. It is to be noted that a sound insulating sheet may be laminated and integrated with the sound absorbing film, or another type of sound absorbing sheet, for example, a foam sound absorbing sheet, a fiber sheet, or paper may be laminated. As shown in FIGS. 1 and 2, the cover 11 of the present invention has a spacer 14 attached to the outside of a sound absorbing film 13 arranged on the inner surface of the soundproof layer 12. The compressor 14 may be of any structure so long as a space can be secured between the sound absorbing film 13 and the piping 10 when the cover 11 is attached around the piping 10. Specifically, the plastic net shown in FIGS. 1 and 2 can be mentioned. In addition, the spacer 14 is made of a plastic fixed to the inner surface of the soundproof layer 12 (outside the sound absorbing film 13) at a predetermined interval along the longitudinal direction of the cover 11. And the like can be cited as preferred examples. As shown in FIG. 2, when the cover 11 is attached around the piping 10, a space is secured between the sound absorbing film 13 and the piping 10 by the spacer 14. Then, the non-contact portion that does not contact the pipe 10 is generated in the sound absorbing film 13. In this example, since the sound absorbing layer 16 constituting the sound insulating layer 12 has an open-cell structure, a large number of holes also exist on the surface of the sound absorbing layer 16, and the inner surface of the sound absorbing film 13 is formed on the inner surface of the sound absorbing film 13. Also, a non-contact portion that does not contact the sound absorbing layer 16 is generated. Therefore, the sound absorbing film 13 has a non-contact portion that does not contact the pipe 10 and a completely non-contact portion that does not contact the pipe 10 or the soundproof layer 12 (the sound absorbing layer 16). to be born. These parts vibrate by receiving the noise (sound energy) from the pipe 10 directly, so that very effective absorption and mitigation of noise (sound energy) is achieved. In the case of the cover 11, the inner surface (sound absorbing film 13) of the cover does not contact the pipe 10 and the spacer 14 is interposed between the pipe 10 and the pipe. When fitting the cover 11 into the pipe 10, the spacer 14 realizes smooth insertion of the cover 11. In particular, when a plastic wire is used as the spacer and fixed to the inner surface of the soundproof layer 12 at a predetermined interval along the longitudinal direction of the cover 11, the length of the cover 11 Since the cover 11 is inserted along the wires arranged in the direction, the cover 11 is smoothly inserted into the pipe 10. In addition, the cover 11 shown in FIGS. 1 to 3 has an outer surface (more specifically, an outer surface of the soundproof layer 12). A heat-shrinkable film 17 made of polyvinyl chloride, polyethylene, polyester, polypropylene, or polystyrene. Covered. In the case of the cover 11 whose outer surface is covered with the heat-shrinkable film 17, the cover 11 is simply fitted into the pipe 10 and heated to obtain the heat-shrinkable film 17 on the outer surface. Heat shrinks, and the cover 1 1 is tightened and attached to the pipe 10, so that adhesive or adhesive The cover 1 1 can be attached to the rooster 10 without any intervention. Further, like the cover 11 shown in FIG. 3, the both ends of the pipe 10 may be left so as to be slidably attached to the peripheral surface of the pipe 10. Fig. 3 shows a case where the force bar 11 is applied to the pipe 10 (straight pipe). The cover 11 is attached, leaving both ends fitted into the L pipe, and this is made slidable. Things. In other words, the cover 11 in FIG. 3 has the outer surface covered with the heat-shrinkable film 17 described above, and the cover 11 is fitted into the pipe 10 without using an adhesive or an adhesive. This is heated to thermally shrink the film 17 on the outer surface, so that the cover 11 is fastened to the pipe 10 and attached. This allows the cover 11 to slide around the pipe 10. For this reason, if the cover 11 is attached to the pipe 10 in advance, if it becomes necessary to cut the pipe 10 to an appropriate length at the site according to the situation at the construction site, the cover 11 will be connected to the pipe 10. Only one side of the pipe 10 needs to be slid, and only the other end of the pipe 10 needs to be cut, so that the length of the pipe 10 can be adjusted more efficiently. Example 1 Example 1 A sound insulation sheet (thickness l mm) having a surface density shown in Table 1 below and a mold chip product obtained by crushing urethane and reshaping the resin in a resin matrix composed of chlorinated vinyl resin (Density 0.05) (manufactured by INOAT CORPORATION), and a sound-absorbing sheet (thickness: 5 mm) having an open-cell structure was laminated and integrated to form a soundproof layer. On the sound absorbing sheet side of this soundproof layer, DCHBSA was added at a ratio of 100 parts by weight to 100 parts by weight of chlorinated polyethylene, and a sound absorbing film sheeted to a thickness of 0.1 mm was arranged. Furthermore, a plastic net was attached to the outside. The laminate was rounded to the outer circumference of a 50-φ diameter pipe, and the outer surface was covered with a polyethylene film to produce a tubular cover. Then, as shown in FIGS. 1 and 2, the cover 11 obtained in this manner is fitted around the pipe 10 (straight pipe) and heated, thereby shrinking the polyethylene film 17 and covering it. One 11 was attached to piping 10. Example 2

 A cover was prepared and attached to the pipe in the same manner as in Example 1 except that the pipe was adjusted to a diameter of 75 φ. Comparative Example 1

 A cover was prepared in the same manner as in Example 1 except that the sound absorbing film and the spacer were not used, and attached to the pipe. Comparative Example 2

A cover was prepared and attached to the pipe in the same manner as in Comparative Example 1 except that the pipe was adjusted to a diameter of 75 φ. The frequency effects of the pipes with the covers of Examples 1 and 2 and Comparative Examples 1 and 2 were measured. The results are shown in Fig. 7 for Example 1, Comparative Example 1 and Comparative Example 3 using a pipe with a diameter of 500, Example 2, Comparative Example 2 and a comparison using a pipe with a diameter of Example 4 is shown in FIG. As shown in Fig. 9, the frequency effect was measured by measuring the drainage noise generated when piping and running water as shown in Fig. 9 using a noise meter (LA-21) placed 1 m away from the piping. 0, manufactured by Ono Sokki Co., Ltd.), measured the noise level, and analyzed the frequency using an FFT analyzer (CF-350, manufactured by Ono Sokki Co., Ltd.). For comparison, drainage noise was measured in the same manner using a pipe with a diameter of 50φ without a cover attached (Comparative Example 3) and a pipe with a diameter of 750 (Comparative Example 4). . Looking at FIGS. 7 and 8, the comparative examples 3 and 4 without the cover OA values of 71 dBA and 73 dBA were compared with those of Comparative Examples 1 and 2 in which the sound absorbing film and the cover without a spacer were attached, but the OA value was 48 dBA, 56 dBA. The attenuation of the sound is about dBA and about 17 to 23 dBA. Furthermore, the OA values of the samples according to Examples 1 and 2 are 40 dBA and 48 dBA, which are approximately 8 dBA when compared with those of Comparative Examples 1 and 2 having the conventional cover. Attenuation is observed, indicating that the example according to the example has excellent noise attenuation (sound insulation performance).

Claims

Scope of word blue 1. In a soundproofing cover provided with a soundproofing layer applied to piping such as a plumbing device and an air conditioner of a building, a sound absorbing film is arranged on the inner surface of the soundproofing layer, and a sound absorbing film is formed outside the sound absorbing film. A space is secured between the sound absorbing film and the pipe by the spacer when the cover is mounted around the pipe by attaching a cover. Soundproof cover for piping. 2. The soundproof cover for piping according to claim 1, wherein the sound absorbing film contains an active component that increases a dipole moment amount. 3. The soundproof cover for piping according to claim 2, wherein the active ingredient contained in the sound absorbing film is one or more kinds selected from a compound containing a benzothiazyl group. 4. The soundproof cover for piping according to claim 2, wherein the active component contained in the sound absorbing film is one or more selected from compounds having a benzotriazole group. 5. The soundproof cover for piping according to claim 2, wherein the active ingredient contained in the sound absorbing film is one or more kinds selected from compounds having a diphenylacrylate group. 6. The soundproof cover for piping according to claim 3, wherein the active ingredient contained in the sound absorbing film is i or two or more kinds selected from compounds having a benzophenone group. 7. The active ingredient is 1: 1 based on 100 parts by weight of the base material constituting the sound absorbing film. The soundproof cover for piping according to any one of claims 2 to 6, wherein the soundproof cover is contained in an amount of 0 to 300 parts by weight. 8. The soundproof cover for piping according to claim 1, wherein the spacer is a plastic net. 9. The outer surface of the soundproof cover is covered with a heat-shrinkable film, the soundproof cover is fitted into a pipe, and the heat-shrinkable film is heat-shrinked and fastened around the pipe, thereby fixing the soundproof cover to the pipe. 2. The soundproof cover for piping according to claim 1, wherein the soundproof cover for piping is mounted so as to be slidable around the piping. 10. The heat-shrinkable film is made of any one of polyvinyl chloride, polyethylene, polyester, polypropylene, and polystyrene. The soundproof cover for piping described in 9. 11. The soundproof cover for piping according to claim 9, wherein the soundproof cover for piping is characterized in that it is attached to a peripheral surface of the piping so as to be able to slide while leaving both ends of the piping.