JPH09269029A - Vibration control/sound isolating sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To insulate vibration generated in a vibrational sound generating source, and absorb a noise generated together with vibration, by arranging on the upper surface of a rubber elastic material sheet main body, a sound absorbing chamber whose capacity is set to be matched to the frequency of a sound to be absorbed, and also arranging an uneven part on the lower surface of this sheet main body. SOLUTION: In a vibration control/sound isolating sheet 1, sound absorbing chambers 3 are arranged in the upper surface of a sheet main body 2, and cavities formed of these sound absorbing chambers 3 are arranged therein. Also, uneven parts 6 are arranged on the lower surface of the sheet main body 2, and cavities formed of the recesses 7 of these uneven parts 6 are arranged thereon. The thickness of the sheet 1 is thinned in a part where these cavities are arranged, thereby the spring constant of the sheet 1 is lowered. Therefore, as a whole, the spring constant of the sheet main body 2 is considerably lowered, therefore vibration generated in a vibration generating source can be insulated. Further, the capacities of the sound absorbing chambers 3 are set to matched to the frequency of a sound to be absorbed, therefore a noise generated can also be absorbed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antivibration / soundproof sheet which is laid under a vibration noise source such as an outdoor unit for air conditioning or OA equipment to insulate vibration and absorb noise.

[0002]

2. Description of the Related Art Conventionally, a sheet made of a rubber-like elastic material is known which is laid under a vibration noise source such as an outdoor unit for air conditioning or OA equipment to insulate vibration. Due to its elasticity, it can insulate vibration but cannot absorb noise.

[0003]

SUMMARY OF THE INVENTION In view of the above points, the present invention provides a vibration and soundproof sheet which is laid under a vibration and noise source to insulate vibration and absorb noise. To aim.

Further, a vibration-proof and sound-proof sheet having sufficient strength as a mount made of a rubber-like elastic material for supporting a vibration and noise generation source, although it can exert an excellent vibration insulation effect and noise absorption effect. The purpose is to provide.

[0005]

In order to achieve the above-mentioned object, a vibration-proof and sound-proof sheet according to claim 1 of the present invention has a volume set on the upper surface of a sheet body made of a rubber-like elastic material in accordance with a frequency at which sound is to be absorbed. The sound absorbing chamber is provided, and the lower surface of the seat body is provided with irregularities.

According to a second aspect of the present invention, in the vibration and soundproof sheet according to the first aspect of the invention, the sound absorbing chambers and the convex and concave portions are arranged so that their planar arrangements are offset from each other.

[0007]

In the vibration and soundproof sheet according to claim 1 of the present invention having the above structure, since the sound absorbing chamber is provided on the upper surface of the sheet body and the cavity is provided by the chamber, these are provided. As for the portion where the sheet is provided, the thickness of the sheet is thin as compared with the case where these are not provided, and thus the spring constant of the sheet is set to be low. In addition, since the lower surface of the seat body is provided with unevenness and a cavity is provided by the recessed portion of the unevenness, the thickness of the sheet is reduced in parts where these are provided compared to the case where these are not provided. Is thin, so the spring constant of the seat is set low. Therefore, since the spring constant of the seat is set to be quite low as a whole, it is possible to effectively isolate the vibration. In addition, since a sound absorbing chamber whose volume is set according to the frequency of sound absorption is provided on the upper surface of the seat body, noise can be effectively absorbed by the noise absorbing action of this chamber.

In addition to this, in the vibration damping and soundproofing sheet according to claim 2 of the present invention having the above structure, the sound absorbing chamber provided on the upper surface of the sheet body and the unevenness provided on the lower surface of the sheet body. There is no convex under the sound absorbing chamber because the planar arrangement of the convexes of is offset from each other,
There is no sound absorbing chamber on the convex portion. Therefore, at the portion where the convex portion that acts as the grounding portion of the sheet is provided, the thickness of the sheet is formed by the sum of the thickness of the sheet main body and the thickness (height) of the convex portion, and thus a sufficient thickness is obtained. Since it is provided, it is possible to provide sufficient strength as a mount made of a rubber-like elastic material that supports the vibration noise generation source.

[0009]

DETAILED DESCRIPTION OF THE INVENTION A sound absorbing chamber generally comprises an opening and an internal cavity having a larger plane area than the opening. The planar layout of the concavities and convexities is not particularly limited, and is appropriately determined according to the spring constant to be set so that the planar arrangement of the convex portions does not overlap the sound absorbing chamber.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. The embodiment is a common embodiment for the invention according to claim 1 and the invention according to claim 2.

FIG. 1 is a partially cutaway perspective view of a vibration and soundproof sheet 1 according to the embodiment as seen from obliquely above, FIG. 2 is a partially enlarged vertical sectional view of the sheet 1, and FIG. Sheet 1
FIG. 4 is a perspective view of the device when turned upside down and seen obliquely from above.

The vibration-proof and sound-proof sheet 1 firstly comprises a sheet body 2 made of a rubber-like elastic material having a predetermined thickness. On the upper surface of the sheet body 2, a plurality of sound absorbing chambers 3 are arranged in a lattice pattern. It is provided. As shown in FIG. 2, each sound absorbing chamber 3 has an opening 4 formed on the upper surface of the seat body 2.
And the opening 4 is made continuous with the opening 4.
It has an internal cavity portion 5 having a larger plane area, and its internal volume is set in accordance with the frequency at which sound is desired to be absorbed.
As shown in FIG. 3, unevenness 6 is provided on the lower surface of the seat body 2 over the entire surface. The unevenness 6 is a combination of a recess 7 and a large number of flat circular projections 8 arranged in a grid pattern. As another example, as shown in FIG. 4, the recess 7 has a slit shape and a projection 8 is formed. May have a rib shape. In any case, as shown in FIG. 5 or FIG. 6, the planar arrangement of the sound absorbing chamber 3 and the convex portion 8 of the unevenness 6 is displaced from each other. The end faces of the large number of convex portions 8 are on the same plane, and this is the ground plane of the sheet 1.

As shown in FIG. 7, the vibration-proof and sound-proof sheet 1 having the above-described structure is laid under a vibration noise source 9 such as an outdoor unit for air conditioning or an OA device, and acts as follows.

That is, in the vibration and soundproof sheet 1 having the above structure, the sound absorbing chamber 3 is provided on the upper surface of the sheet body 2 and the cavity is provided by the chamber 3 so that these are provided. For the parts that have been installed, compared to the case where these are not provided, the seat 1
Is thin, so that the spring constant of the seat 1 is set low. Further, since the unevenness 6 is provided on the lower surface of the sheet body 2 and the cavity is provided by the concave portion 8 of the unevenness 6, the portion where these are provided is compared with the case where these are not provided. The sheet 1 has a small thickness, and thus the spring constant of the sheet 1 is set to be low.
Therefore, since the spring constant of the seat 1 is set to be quite low as a whole, the vibration generated in the vibration noise generation source 9 can be effectively insulated. At the same time, since the sound absorbing chamber 3 having a volume set according to the frequency of sound absorption is provided on the upper surface of the seat body 2, the noise absorbing function of the chamber 3 causes the vibration noise generating source 9
It is possible to effectively absorb the noise generated in the.

Further, as shown in FIG. 5 or 6, the sound absorbing chamber 3 provided on the upper surface of the seat body 2 and the convex portion 8 of the unevenness 6 provided on the lower surface of the seat body 2 are arranged in a plane. Since the sound absorbing chamber 3 is displaced, there is no convex portion 8 below the sound absorbing chamber 3, and there is no sound absorbing chamber 3 above the convex portion 8. Therefore, in the portion of the sheet 1 where the convex portion 8 acting as the grounding portion is provided, the thickness of the sheet 1 is constituted by the sum of the thickness of the sheet body 2 and the thickness (height) of the convex portion 8, Since it has a sufficient thickness, it has a sufficient strength as a mount made of a rubber-like elastic material for supporting the vibration noise generation source 9. Therefore, it is possible to provide the vibration-proof and sound-proof sheet 1 with less fatigue and excellent durability.

As a manufacturing method, the sound absorbing chamber 3 and the unevenness 6 can be simultaneously molded.

[0017]

The present invention has the following effects.

That is, first, in the vibration-proof and sound-proof sheet according to claim 1 of the present invention having the above-mentioned structure, the volume of the vibration-proof and sound-proof sheet is set on the upper surface of the rubber-like elastic material sheet body in accordance with the frequency at which the sound is to be absorbed. Since the chamber is provided and the lower surface of the seat body is provided with irregularities, and the spring constant of the seat is set to be considerably low as a whole, the vibration generated in the vibration noise source such as the outdoor unit for air conditioning or OA equipment Can be effectively insulated. At the same time, the noise absorbing action of the sound absorbing chamber can effectively absorb the noise generated in the vibration noise generating source.

In addition to this, in the vibration and soundproof sheet according to claim 2 of the present invention having the above structure, the sound absorbing chamber provided on the upper surface of the sheet body and the unevenness provided on the lower surface of the sheet body. Since the planar arrangement of the convex parts of the is offset from each other and the thickness of the sheet is set to be thick partially, it has sufficient strength as a rubber-like elastic mount that supports the vibration noise source. There is. Therefore, it is possible to provide a vibration-proof and sound-proof sheet with less fatigue and excellent durability.

[Brief description of drawings]

FIG. 1 is a partially cut perspective view of a vibration and soundproof sheet according to an embodiment of the present invention.

FIG. 2 is a partially enlarged vertical sectional view of the sheet.

FIG. 3 is a perspective view of the sheet with the sheet turned upside down.

FIG. 4 is a perspective view showing another example of the uneven shape.

FIG. 5 is a plan view of the sheet.

FIG. 6 is a plan view of a seat according to another example.

FIG. 7 is a perspective view showing a usage state of the seat.

[Explanation of symbols]

 1 Vibration and Soundproof Sheet 2 Sheet Body 3 Sound Absorption Chamber 4 Opening 5 Inner Cavity 6 Concavity 7 Concave 8 Convex 9 Vibration Noise Source

Claims (2)

[Claims] 1. A sound absorbing chamber (3) having a volume set according to a desired frequency of sound absorption is provided on an upper surface of a sheet body (2) made of a rubber-like elastic material, and an uneven surface is formed on a lower surface of the sheet body (2). A vibration-proof and sound-proof sheet having (6). 2. The vibration and soundproof sheet according to claim 1, wherein the sound absorbing chamber (3) and the projections (8) of the unevenness (6) are displaced from each other in a plane arrangement. .