JP3065787U - Sound insulation flexible joint for air conditioning - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a sound insulation flexible joint for air conditioning having a high sound insulation effect. SOLUTION: On the inner surface of a skin 2 made of glass cloth,
Flanges 5 and 5 are attached to both ends of a cylindrical body 4 which is formed by laminating a sound insulating material 3 formed by kneading lead into synthetic rubber and having a corrugated cylindrical shape. High-frequency sound, especially high-frequency sounds can be effectively removed, and the flexibility is enhanced.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an air-conditioning sound-insulating flexible joint used to connect a duct connecting a supply source of air-conditioning air and a space to be air-conditioned.

[0002]

[Prior art]

 Conventionally, as this kind of flexible joint, one using a glass cloth that absorbs a vibration sound generated from a blower as a supply source of air for air conditioning is known.

[0003]

[Problems to be solved by the invention]

 However, if the flexible joint is installed close to the blower, it cannot absorb particularly high frequency sound generated by the blower, and the noise generated by the blower leaks to the outside through the joint as it is.

An object of the present invention is to provide a sound-insulating flexible joint for air-conditioning in which such a problem is solved.

[0005]

[Means for Solving the Problems]

 According to the invention of claim 1 of the present application, a flange is attached to both ends of a cylindrical body in which a sound insulating material made of unvulcanized rubber containing lead is overlapped on the inner surface of a skin made of glass cloth. As a result, it is possible to excel in heat resistance as well as to insulate from low-frequency sounds to high-frequency sounds, and to effectively insulate especially high-frequency sounds.

According to a second aspect of the present invention, the glass cloth and the sound insulating material are not separated because the glass cloth and the sound insulating material are sewn and integrated with each other.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an air-conditioning sound-insulating flexible joint. The air-conditioning sound-insulating flexible joint 1 is formed by stacking a sound insulating material 3 made of an unvulcanized rubber material containing lead on the inner surface of a skin 2. It is configured by attaching flanges 5 and 5 to both ends of the cylindrical body 4 having the shape.

More specifically, FIG. 1 shows a twill-woven glass cloth coated with aluminum foil on one side and an inner surface of a 0.7 mm-thick outer skin 2, and powdered unvulcanized rubber. A 1.0mm thick sound insulating material (containing 55% to 60% by weight of lead) kneaded with 3) and a flat plate obtained by stacking and sewn the same so that the overlapped portion at both ends is 30mm to 50mm. The overlapped portions are sewn together to form a cylindrical body 4, and flanges 5 and 5 made of equilateral angle steel or flat steel are attached to the outside of both ends of the cylindrical body 4 to have a diameter of 75 mm to 1200 mm. The air-conditioning sound insulation flexible joint 1 having a length of about 150 mm to 350 mm is used.

Although it is conceivable to bond the skin 2 and the sound insulating material 3 using an adhesive, the two cannot be bonded due to a difference in expansion and contraction ratio between the two. Therefore, the suture was completed as described above. In the case of non-combustible use, use a glass fiber thread or stainless steel thread as the suture.

The flanges 5, 5 are attached by placing the flanges 5, 5 along the outer sides of both ends of the cylindrical body 4, and holding the holding plates 6 along the inner surfaces of both ends of the cylindrical body 4, and screwing the flanges 5, 5. Do it by doing.

The air-conditioning sound-insulating flexible joint 1 may have a rectangular cross section as shown in FIG.

To explain this, a sound insulation material 3 having a thickness of 1.0 mm, which is obtained by kneading powdered lead into unvulcanized rubber similar to that described above, is attached to the inner surface of a 0.7 mm thick glass cloth as a skin 2. The flat plate formed along the shape is bent so that the overlapped portion is 30 mm to 50 mm at both ends to form a tubular shape having a square cross section, and the overlapped portion is sewn to form a tubular body 4. Outside the both ends of the cylindrical body 4, flanges 5, 5 of equilateral angle steel or flat steel having a quadrangular cross section along the cylindrical body 4 are arranged, and then pressed against the inner surfaces of both ends of the cylindrical body 4. The flanges 5 and 5 were attached to both ends of the cylindrical body 4 by screwing the plate 6 along the side, and the sound insulating flexible joint 1 for air conditioning was obtained.

In the above embodiment, a spiral piano wire or an annular piano wire extending in the axial direction of the cylindrical body 4 is shielded from the skin 2 in order to secure the shape of the cylindrical body 4 for reinforcement. It may be applied between the sound materials 3.

The sound insulating flexible joint 1 for air conditioning thus obtained is flexible because the sound insulating material 3 itself made of an unvulcanized rubber material is flexible and the glass cloth is also flexible. As shown in the table below, compared to conventional air-conditioning flexible joints using only glass cloth, sound can be shielded from low-frequency sounds to high-frequency sounds, especially at high frequencies. Sound insulation was possible. Table 1 Sound insulation characteristics (transmission loss) dB / m ² The glass cloth used was a heat-resistant aluminum glass cloth (a twill woven glass cloth with a mass of 0.46 kg / m ² and a 7-micron aluminum foil on one side), which is a commonly used surface treated with aluminum. And a piano wire inserted inside.

[0016]

[Effect of the invention]

 According to the invention described in claim 1 of the present application, it is excellent in heat resistance, and can also shield sound from low frequency to high frequency, and can effectively remove particularly high frequency sound.

According to the invention described in claim 2 of the present application, by sewing the glass cloth and the sound insulating material, the difference in the expansion and contraction ratio between the skin and the sound insulating material is surrendered, so that the two can be easily and reliably connected. Can be bound.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a partially cutaway side view of FIG. 1;

FIG. 4 is a perspective view showing another embodiment.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Sound insulation flexible joint for air conditioning 2 Skin 3 Sound insulation material 4 Cylindrical body 5
Flange

Claims (2)

[Utility model registration claims] 1. A sound insulating flexible joint for air conditioning, wherein flanges are attached to both ends of a cylindrical body formed by superposing a sound insulating material made of unvulcanized rubber containing lead on the inner surface of a skin made of glass cloth. 2. The sound-insulating flexible joint for air conditioning according to claim 1, wherein the glass cloth and the sound insulating material are sewn together to be integrated.