JPH0513519B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sound insulating material, and more particularly to a sound insulating material having a reduced volume and an improved sound insulating effect.

[Prior art]

Conventionally, as a sound insulating material that prevents the vibrations of underwater structures such as ship hulls from being transmitted to hydrophones, for example, as shown in Fig. 1, a skin plate 2 is attached to a rubber layer 1, and the thickness of the rubber layer 1 is In order to make the rubber thinner, treatments such as metal or FRP boxes 3 and flat tubes 4 were embedded in the rubber. however,
As the depth of water increases, external pressure increases,
A need arises to increase the strength of the embedding material. Therefore, unless a larger amount of embedding material is added, the spring constant becomes higher and a sufficient sound insulation effect cannot be obtained.

[Purpose of the invention]

This invention was devised in view of these conventional problems, and its purpose is to provide a sound insulating material that can reduce the volume of the material and increase the sound insulation effect. .

[Structure of the invention]

In order to achieve the above-mentioned object, the present invention provides a sound insulating material comprising a plurality of cavities arranged inside a rubber layer, in which an air passage connected to the inside of the cavity is formed between each of the cavities, and In part, the gist is that a flexible container is connected that can transmit external pressure to the air inside the container via an air passage.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 2 shows a sectional view of a sound insulating material embodying the present invention. This sound insulating material has a hydrophon 13 embedded in an outer skin 10 consisting of a corrugated plate 11 and a rubber layer 12. A plurality of cavities 14 in the rubber layer 12 between the structure W and each cavity 14.
It has a structure in which a space passage 15 is provided to connect the two.

One of the cavities 14 is connected through an air passage 16 to a flexible container 17 that expands and contracts in response to external pressure, and applies an air pressure equal to the external pressure inside the flexible container 17 to the rubber layer through the air passage 16. Hollow 1 in 12
4.

The size of the cavity 14 and the thickness of the rubber layer 12 are determined by the spring characteristics of the sound-insulating outer skin 10 and the underwater structure W, so various shapes can be created depending on the application and manufacturing method.

For example, FIGS. 3 and 4 show an example of the cross-sectional view between the rubber support part 18 and the outer panel 19, and between the rubber support part 18 and the damping material 20 (heavy object), etc. While forming a cavity 14 of the shape, each cavity 1
4 are communicated with each other by an air passage 15. Also 2
1 indicates a filling material for the hydrophon 13, and W indicates an underwater structure such as a ship's hull.

Further, FIG. 5 shows the structure of the flexible container 17, and the flexible container 17 is installed at a location where it can receive the necessary external pressure and prevent unnecessary external forces, as shown in FIG. 5a. The shape is not particularly limited as long as it is made of a rubber membrane 22, a rubber membrane containing a reinforcing material 23 such as cloth, or other flexible material and maintains airtightness.

Note that 16 indicates an air passage communicating with the cavity 14.

Next, FIGS. 6 to 8 show other embodiments of the present invention, in which the present invention is applied to a sound insulating material that combines a sound absorbing material 24 provided with a cavity 14a and a reflective material 25 provided with a cavity 14b. It was applied.

If the sound absorbing material 24 and the reflecting material 24 are composed of the cavities 14 in the rubber layer, they can be used in all cases, and the cavities 14a and 14b communicate with each other via the air passages 15, and are formed at the end portions. cavity 14
a, 14b communicate with an air chamber 17a of the flexible container 17 via an air passage 16.

As described above, the present invention provides an air passage 15 connecting the cavities 14 and an air passage in a part of the cavity 14 in order to maintain the air pressure in the cavity 14 equal to the external pressure and prevent the influence of external pressure fluctuations on sound insulation performance. Since the structure is connected to the flexible container 17 through which the external pressure can be transmitted to the air inside the container without resistance through the flexible container 17, the air pressure in the sound insulating material is balanced with the external pressure by the connected flexible container 17. Therefore, it does not deform due to changes in external pressure, and it is possible to create a shape that takes into account only the sound insulation effect without considering external pressure.

〔Effect of the invention〕

The present invention provides a sound insulating material having a plurality of cavities arranged inside a rubber layer as described above, in which an air passageway connected to the inside of the cavity is formed between each of the cavities,
A flexible container that can transmit external pressure to the air inside the container via an air passage is connected to a part of this cavity, so the pressure of the air in the sound insulation material is balanced with the external pressure by the connected flexible container. Because of this,
Since it does not form due to changes in external pressure, it is possible to take a shape that only considers the sound insulation effect without considering external pressure, and therefore the volume (thickness) of the sound insulation material can be reduced and the sound insulation effect can be significantly improved. effective.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional sound insulating material, Fig. 2 is a sectional view of a sound insulating material according to the present invention, and Figs.
The figures are a plan view and a vertical sectional view showing another embodiment of the present invention, FIG. 5 is a perspective view of a flexible container, FIG. 5a is an enlarged sectional view of section A in FIG. 7 is a plan view showing another embodiment of the invention, FIG. 7 is a longitudinal sectional view of FIG. 6, and FIG. 8 is a bottom view of FIG. 7. 12...Rubber layer, 14...Cavity, 15, 16...
...Air passage, 17...Flexible container.

Claims (1)

[Claims] 1. In a sound insulating material consisting of a plurality of cavities arranged inside a rubber layer, an air passage connected to the inside of the cavity is formed between each cavity, and a part of the cavity is exposed to external pressure through the air passage. A sound insulating material characterized by connecting a flexible container capable of transmitting sound to the air inside the container.