JPH09198050A - Water pressure resisting sound insulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an water pressure resisting sound insulator for underwater acoustic equipment which has superior sound insulation effect at deep water depth by preventing a platy rubber material for sealing from coming into contact under high water pressure owing to the collapse of a sound insulation chamber due to water pressure. SOLUTION: Both surfaces of a lattice-shaped rubber material 1 which has a 60-90% aperture ratio are sealed with platy rubber materials 2 to form plural sound insulation chambers 3, cork rubber 4 which has 60-95% area of the aperture area of the sound insulation chambers 3 is arranged in sound insulation chamber, and a platy rubber material 1 is provided with a metal plate 5 to make the lattice-shaped rubber material 1 and the cork rubber 4 in the sound insulation chambers 3 withstand water pressure mutually.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound insulation material used in underwater acoustic equipment, and more particularly to a water pressure resistant sound insulation material having excellent sound insulation under water pressure.

[0002]

2. Description of the Related Art In an underwater acoustic device such as an ultrasonic wave receiver, for example, a sound insulating material is provided to cut noise from a specific direction and to have a directionality of reception.
FIG. 3 is a view showing a conventional water pressure resistant sound insulating material of this type.
Is a cross-sectional view and (b) is a plan view. As shown in FIG. 3, air is enclosed by sealing the upper and lower surfaces of the lattice-shaped rubber material 1 formed in a lattice shape with the plate-shaped rubber material 2. A plurality of sound insulation chambers 3 are formed, and the air in the sound insulation chamber 3 provides a sound insulation effect.

Further, as another sound insulating material, there is a so-called cork rubber in which air-containing cork particles are hardened with rubber into a plate shape, which is not shown, but all of them support an air portion with a flexible structure. Has obtained a sound insulation effect.

[0004]

However, the above-mentioned conventional sound insulation material has the following disadvantages. That is,
In order to enhance the sound insulation effect of the sound insulation material, it is required that the ratio of the sound insulation room which is an air chamber is large. However, by disposing the plate-shaped rubber material on both sides of the lattice-shaped rubber material shown in FIG. With the sound insulation material of the formed structure, the sound insulation room is crushed when a large water pressure is applied and the upper and lower rubber materials come into contact with each other, so the sound insulation effect is lost, and even in the case of the sound insulation material by cork rubber, it is inherent in the cork grains. Since the air part is compressed by water pressure, the sound insulation effect is lost, and as a result, both the sound insulation material shown in FIG. 3 and the sound insulation material made of cork rubber can obtain only a water pressure resistance performance of about 50 m in water depth. It was impossible to use in deep water.

[0005]

In order to solve such a problem, the present invention relates to a water pressure resistant sound insulation material used for underwater acoustic equipment, wherein both sides of a lattice-shaped rubber material having an opening ratio of 60 to 90% are plate-shaped. A plurality of sound insulation chambers are formed by sealing with a rubber material, and cork rubber having an area of 60 to 95% with respect to the opening area of the sound insulation chamber is arranged in each sound insulation chamber, and at least the surface of the underwater acoustic device side. The plate-shaped rubber material is provided with a metal plate.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B are views showing an embodiment of a sound insulation material according to the present invention, wherein FIG. 1A is a sectional view and FIG. 1B is a plan view. In the figure, 1 is a lattice rubber material, 2 is this rubber material 1
The plate-like rubber material adhered so as to seal the upper and lower surfaces of the above, 3 is a plurality of sound insulation chambers formed by the lattice-like rubber material 1 and the plate-like rubber material 2, and 4 is a cork rubber in which cork grains are hardened with rubber. The cork rubber 4 is provided in each sound-insulating chamber 4 so that an air layer can be obtained almost uniformly around the cork rubber 4, and is bonded and fixed to the plate-shaped rubber material 2.

Here, the opening area ratio of the openings in the lattice-shaped rubber material 1, that is, the openings of the sound insulation chamber 3 is set to 60 to 90%, whereby the pressure resistance performance and the sound insulation effect are balanced. Similar to the above, the size of each cork rubber 4 is set to an area of 60 to 95% of the opening area of the sound insulation chamber 3 in order to obtain a balance between the pressure resistance performance and the sound insulation effect.

Reference numeral 5 is a metal plate attached to the outer surface of each rubber material 2. The sound insulating material having such a configuration is mounted on one metal plate 6 side to an underwater acoustic device such as an ultrasonic wave receiver (not shown) and on the other metal plate 6 side to a support (not shown) that sinks in water, for example. When water pressure is applied to the sound insulating material due to the lowering of the support, the lattice-shaped rubber material 1 supports the pressure at a low pressure and the shape of the sound insulating chamber 3 is secured.

Then, as the water pressure increases, the lattice-shaped rubber material 1
Since the lattice part, that is, the part surrounding the sound insulation chamber 3 is deformed, the thickness of the sound insulation material becomes thin, but eventually, the sound insulation material 2 comes into contact with the cork rubber 4 in the sound insulation chamber 2, and the deformation of the lattice part and the deformation of the cork rubber 4 reduce the water pressure. Since the support is provided, it is possible to prevent the contact between the plate-shaped rubber members 2 on both sides of the sound insulating chamber 3 due to the collapse of the sound insulating chamber 3 under high water pressure.

That is, since the lattice-shaped portion of the lattice-shaped rubber material 1 supports the thickness change due to water pressure, the water pressure resistance is improved as compared with the case where the cork rubber 4 is used alone. FIG. 2 is a diagram showing the measured values of the sound insulation characteristics of the above-mentioned sound insulation material at a water depth of 200 m. As shown in this figure, the sound insulation material is 20 for sound in the frequency band of 1 to 20 kHz.
It was confirmed that there is a sound insulation effect even at a depth of 0 m.

In the above embodiment, when the support is made of metal, the metal plate 5 on the support side of the two metal plates 5 can be omitted. Further, the thicknesses of the sound insulation chamber 3 and the metal plate 6 are selected according to the frequency band in which the sound insulation effect is required.

[0012]

As described above, according to the present invention, a plurality of sound insulating chambers are formed by sealing both sides of a lattice-shaped rubber material having an opening ratio of 60 to 90% with a plate-shaped rubber material, and opening of the sound insulating chambers. Cork rubber having an area of 60 to 95% of the area is arranged in each sound insulation room, and a metal plate is provided on at least the plate-like rubber material on the side facing the underwater acoustic equipment. Since the water pressure is supported mutually with the cork rubber of the above, it is possible to prevent the contact of the plate-shaped rubber material for sealing due to the collapse of the sound insulation room due to the water pressure under high water pressure, and the excellent sound insulation effect at deep water depth. It is possible to obtain the effect that it is possible to realize a water pressure resistant sound insulation material for underwater audio equipment.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a sound insulation agent according to the present invention.

FIG. 2 is a diagram showing measured values of sound insulation characteristics of the sound insulation material of FIG. 1 at a water depth of 200 m.

FIG. 3 is a view showing a conventional sound insulation agent.

[Explanation of symbols]

 1 Lattice rubber material 2 Plate rubber material 3 Sound insulation room 4 Cork rubber 5 Metal plate

 ─────────────────────────────────────────────────── --Continued front page (72) Inventor Minoru Sato 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd.

Claims (1)

[Claims] 1. A water pressure resistant sound insulation material used for underwater audio equipment, wherein both sides of a lattice-shaped rubber material having an opening ratio of 60 to 90% are sealed with plate-like rubber materials to form a plurality of sound insulation chambers. A cork rubber having an area of 60 to 95% with respect to the opening area of each is arranged in each sound insulation room, and a metal plate is provided on at least the plate-shaped rubber material on the side facing the underwater acoustic device. Sound insulation material.