JP2000088184A - Vacuum soundproofing heat insulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To damp vibration transmission to increase the performance of a vacuum soundproofing material by adopting a plate provided with mesh-like or projected articles as a pressure tight supporting material, and using the overlapped plates to make contact parts dotlike. SOLUTION: In this vacuum soundproofing heat insulator, the ribs 6 of rib- attached expansion metals 5 and 5a are facedly and overlappedly arranged between sound receiving and diffusing side airtight materials 2 and 2a, a pressure tight supporting material 4 constituted with a wire 9 nipped is arranged between the ribs 6, and is fittably engaged with the inside of a frame material 3 having a U-shaped cross section in a periphery, the materials 3 and 2 are joined and air tightened, and the inside of the said insulator is evacuated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum body for the purpose of soundproofing and heat insulation, and is used for cases of machines and home appliances, sound insulation walls on roads, railways and construction sites, floors, walls and ceilings of buildings. Things.

[0002]

2. Description of the Related Art In a conventional soundproofing material utilizing vacuum, a honeycomb core is inserted as a pressure-resistant support material for an airtight material as disclosed in Japanese Patent Application No. 58-138845, for example, in order to maintain a vacuum layer. Therefore, when the sound is radiated from the back surface of the sound receiving surface material, the sound is not transmitted by vacuum in the part without the honeycomb core, but the sound is transmitted as vibration in the honeycomb core part, and the sound is transmitted from the airtight material on the radiation side. It is again emitted as sound.

[0003] Therefore, the pressure-resistant support material determines the performance as a vacuum soundproof material. However, the honeycomb core has a large ratio of the contact length of the spacing material to the area of the airtight material, and the spacing material is hard. In addition, the transmission of the vibration with almost no attenuation of the material reduces the soundproofing effect.

[0004]

The problem is that vibration transmission between the sound receiving surface and the radiation surface is large in the vacuum soundproof material.

[0005]

The object of the present invention is to improve the soundproofing effect by increasing the damping at the time of transmitting vibration by using a metal plate provided with a mesh-like object or a projection between airtight members.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to paragraphs [0007] and [0] of the original application.
022 "is divided. About the material and joining method used in the present invention. The airtight material is a material that does not allow gas permeation, and is mainly made of a thin metal plate such as stainless steel, iron, or aluminum, a damping steel plate, an amorphous alloy sheet, a plastic laminate material of a metal foil such as copper or aluminum, or a metal foil and a rigid material. A composite material obtained by integrating a plastic or a wooden board is used.

[0007] The material of the pressure-resistant support material must be such that no gas is generated in a vacuum, and the material has the strength to withstand the vacuum pressure and the load on the floor. Metals such as iron, aluminum, and stainless steel, and plastics are mainly used. And so on. As the shape of the pressure-resistant support material, expanded metal or wire mesh is used as a mesh-shaped material. Specific examples of the shape of expanded metal and wire mesh include expanded metal of Japanese Industrial Standard G3351; wire mesh represented by G3552 and G3553; wirelass of A5504;
There are three-dimensional molded products such as metal laths such as 505 cobras, corrugated laths, and rib laths.

[0008] The metal plate provided with the protrusion is cut into a U-shaped or mountain-shaped at predetermined intervals so that the height of the outer plate is constant, and the portion is raised and raised to form a section. A slit is cut out and squeezed out by a press. A side plate is extended to form a sloping inclined surface in which the cut-out portion is lifted.

Materials used for the frame material are mainly metals and plastics.

[0010] The degree of vacuum is a medium vacuum region of ^10-2 pascal or less. For vacuum evacuation, when a vacuum evacuation hole is provided in a hard material, a component that can be easily sealed off is used. In the case of a soft airtight material such as a laminate material, during the process of pulling out the nozzle from between the sealed cut parts or the stacked airtight materials,
Pressing both sides of the airtight material of the pulled-out part and heat-welding.

Regarding the sealing method. When the airtight material and the frame material are both metal, welding, brazing, or bonding is used, and when the joining surface is metal and nonmetal, the bonding or heat welding method is used. When joining an airtight material and an airtight material without using a frame material, brazing or bonding is used for a thin metal plate, and thermal welding is used for a laminated material.

FIG. 1 is an external view of a first embodiment. FIG. 2 is a partial sectional perspective view of the outer peripheral portion. The pressure-resistant support member 4 has V-shaped ribs 6 at intervals of about 5 to 10 cm in the expanded metal 5, and the ribs 6 are provided to reduce bending and bending in the orthogonal direction. The expanded metal 5 with the ribs 6 is overlapped with two ribs 6 in the same direction, and a wire 9 is sandwiched between the ribs 6 so as to intersect the ribs 6.

In this embodiment, one wire is sandwiched between the expanded metals. However, when it is necessary to use a plurality of wire meshes or reduce the thickness, two wires cannot be sandwiched. The ribs 6, 6a of the expanded metals 5, 5a may be arranged so as to intersect with each other to serve as a pressure-resistant support member. Ribs 6 and 6a are provided with holes 8 and 8a for evacuation. When an expanded metal without ribs is used, a wire mesh is used between the expanded metals 5 and 5a.

In the second embodiment, the external view is in accordance with FIG. FIG. 3 is a partial sectional perspective view of the outer peripheral portion. The pressure-resistant support member 10 is formed by stacking two wire meshes 13 and 13a. The size of the mesh of the wire meshes 13 and 13a is determined by the bending of the wire 14 due to the atmospheric pressure load and the recess of the airtight material 11 between the wires. Only the first-stage wire 14 is in contact with the airtight material 11, and the interval is such that it does not contact the orthogonal second-stage wire 15. The smaller the number of contacts due to the overlap of the two wire meshes 13 and 13a, the better. Therefore, when the soft airtight material 11 is used,
It is desirable that the first-stage wire 14 is narrow and the second-stage wire 15 is wide.

In the wire meshes 13 and 13a, the intersections of the wires are integrated by welding, but it is better not to weld them from the viewpoint of vibration damping. Therefore, it is desirable to weld only the intersections necessary during assembly. It is desirable to shift the planar position of the wire in the same direction in terms of vibration transmission attenuation.

In the first and second embodiments, the pressure-resistant support members 4 and 10 thus combined are housed inside the U-shaped frame members 3 and 12 arranged along the outer periphery of the vacuum body 1 and , 12
Is sealed by joining the frame members 3 and 12 and the airtight members 2 and 11 to evacuate the inside.
In addition, as shown in FIG. 3A, the frame member 12a has a convex shape, and the wire mesh wire 15,
15a may be provided.

FIG. 4 is a partial sectional perspective view of the outer peripheral portion of the third embodiment. The pressure-resistant support member 17 makes a U-shaped cut 19 in the metal plate 18 at a predetermined interval, erects the section 20,
Wire mesh 21 and expanded metal 22 with ribs
Are used repeatedly. The periphery is housed inside the U-shaped frame material 25 of the vacuum body 16 and the airtight materials 26 and 26a are
5 and airtightly joined.

The size of the mesh of the wire mesh 21 is set so that the bending between the sections of the wire mesh 21 and the bending of the rib 23 of the expanded metal 22 are within an allowable range. Sealing is performed by extending the hermetic material 26 to the outside of the metal plate 18 that has been raised along the outer periphery of the metal plate 18.
a. The rib 23 is provided with a hole 24 for evacuating the rib groove. When the thickness of the vacuum body needs to be reduced, the section of the metal plate 18 and the rib 23 of the expanded metal 22 may be directly overlapped without using the wire mesh 21.

[0019]

When the airtight material of the vacuum body receives a sound, the energy is divided into four parts: surface reflected sound, absorption by the airtight material, sound radiated to the back surface due to vibration of the airtight material, and transmission to the pressure-resistant support material. . Among them, the sound radiated to the back surface of the airtight material is not transmitted at all because it is radiated into the vacuum. Therefore, the sound radiated from the back surface of the vacuum body is only the vibration of the material due to the sound transmitted to the airtight material, the pressure-resistant support material, and the airtight material.

As for the material of the airtight material, for example, when a heavy metal plate is used as the airtight material, the surface reflected sound and vibration transmission are large, and the sound radiated to the back surface of the airtight material is reduced. Conversely, in the case of a plastic laminated material of metal foil, which is a thin and lightweight material, sound transmission to the back surface of the sound-receiving-side airtight material is large, and surface reflected sound and vibration transmission are small.

According to the present invention, the amount of vibration transmission is reduced by overlapping the pressure-resistant support members in a point-like manner between the pressure-resistant support members. It has been mathematically known that the damping of vibration due to a sudden change can be obtained by Equation 1 as follows.

"Equation 1" L = 10 LOG (α- ^0.5 +
α ^0.5 ) ² −6 L: Attenuation α: Change rate of cross-sectional area

From this equation, the rate of change of the cross-sectional area is, for example, 1
In the case of 1/1000, attenuation of about 14 dB is obtained, and in the case of 1/1000, attenuation of about 24 dB is obtained.

In the first embodiment, the expanded metal ribs and wires are used. In the second embodiment, the expanded metal ribs and the wire mesh and the wire mesh wires are used. At the intersection of the wire mesh and the section in a point-like manner. Accordingly, the pressure is greatly attenuated between the pressure-resistant support members as shown in the above equation, and transmitted to the radiation-side airtight material to be radiated as sound.

As for the general effect of using vacuum, a high effect can be expected for soundproofing and heat insulation. In general, a sound insulating material based on the mass rule improves the sound insulating performance in proportion to the weight, but decreases the sound absorbing property. Therefore, in order to obtain both the sound insulation and the sound absorption performance, a sound absorbing material is provided on the surface using a heavy material, or an air layer is provided to respond to the combination of various materials.

On the other hand, a soundproofing material utilizing a vacuum is provided with a layer without air, which is a sound transmitting substance, so that sound insulation and sound absorption can be performed simultaneously. Sound absorption is not affected by thickness.
There are performances that cannot be obtained with conventional soundproofing materials, such as a high sound insulation effect even with a light weight and a high sound insulation performance even at low frequencies. In addition, under use conditions, it can be used outdoors or in cold regions where light weight, fire resistance, water resistance, freeze-thaw resistance and the like are required at the same time.

With respect to heat, foamed plastics and glass wool, which are general heat insulating materials, are heat insulating materials that control the convection of air, so that their heat insulating performance is determined in proportion to the thickness. In contrast, the use of vacuum results in radiation and heat transfer of the hermetic support. Therefore, heat insulation irrespective of the thickness becomes possible.

The present invention is a vacuum sound insulating material mainly intended for soundproofing, and the heat insulation is limited to the thermal insulation obtained as a result of manufacturing for soundproofing. Higher heat insulation performance can be achieved by making the surface a mirror finish or, in the case of plastic, applying aluminum foil.

[0029]

[Brief description of the drawings]

FIG. 1 is an external view of a vacuum body.

FIG. 2 is a partial sectional perspective view of an outer peripheral portion. (Example 1)

FIG. 3 is a partial sectional perspective view of an outer peripheral portion. (Example 2)

FIG. 4 is a partial sectional perspective view of an outer peripheral portion. (Example 3)

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum body 2 Airtight material 3 Frame material 4 Pressure-resistant support material 5 Expanded metal 6 Rib 9 Wire 10 Pressure-resistant support material 11 Airtight material 12 Frame material 13 Wire mesh 14 Wire 16 Vacuum body 17 Pressure-resistant support material 18 Metal plate 20 Section 21 Wire mesh 22 expanded metal 23 rib 24 hole

Claims (1)

[Claims] 1. A pressure-sensitive support member comprising a mesh-shaped material or a plate provided with protrusions at predetermined intervals in a sealed body made of an airtight material, and a plurality of any of the pressure-resistant support materials are arranged in a stack, and the inside is evacuated. Vacuum sound insulation.