JP2566697Y2 - Flexible joint for duct - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible joint for a duct suitable for use as a flexible joint of an air conditioning duct, particularly a general air conditioning duct.

[0002]

2. Description of the Related Art Conventionally, as a flexible joint of an air conditioning duct, asbestos cloth has been used in both a general air conditioning duct and a smoke exhaust duct. However, asbestos has a problem as a lung cancer-causing substance, so glass cloth is used instead of asbestos in flexible joints of ducts for general air conditioning, and rock wool cloth instead of asbestos in flexible joints of smoke exhaust ducts. A heat-resistant cloth such as a silica fiber cloth is used.

[0003]

[Problems to be solved by the invention] For example, the general air-conditioning duct in an underground shopping mall is always operating, stops in an emergency such as a fire, and is always stopped by an air conditioner switching damper, and operates in an emergency. Switch to smoke exhaust duct. There is no problem if such duct switching is performed without any time lag, but there is a possibility that a time lag may occur in duct switching for some reason. There has been a demand for a proposal of a duct flexible joint that can be used as a flexible joint of an air conditioning duct.

The inventor of the present invention has satisfied the above-mentioned demand by replacing a heat-resistant cloth such as a rock wool cloth or a silica fiber cloth used for a flexible joint of a smoke exhaust duct with a glass cloth of a general air conditioning duct. Tried,
Although there is no problem with heat resistance and strength when used for a short time in the event of a fire, etc., the strength is insufficient when used constantly, such as a duct for general air conditioning, and the bending strength is a measure of breakage due to vibration. Was found to be significantly short.

[0005]

Means for Solving the Problems The present inventor has proposed that a tubular joint cloth is made of an inner and outer double joint cloth in which an inner joint cloth and an outer joint cloth are overlapped, and the inner joint cloth is made of E glass fiber. By providing the woven cloth and the outer joint cloth with a cloth woven with high heat-resistant glass fiber in which only the surface layer of E glass fiber is acid-treated, the outer joint cloth has sufficient bending strength as a flexible joint of the duct. And completed the present invention.

That is, the flexible joint for a duct according to the present invention is a flexible joint for a duct, wherein the tubular joint fabric is a double inner / outer joint fabric in which an inner joint fabric and an outer joint fabric are overlapped. Is a cloth woven with E glass fiber, and the outer joint cloth is a cloth woven with high heat resistant glass fiber in which only the surface layer of E glass fiber is acid-treated, and the inner joint cloth and the outer joint cloth are Both have a thickness of 7 on the outer surface
An aluminum layer having a thickness of at least μm is provided.

[0007] The cloth woven with the E glass fiber is
Generally, the fiber diameter is 6μ using warp and bulked weft.
m twill weave, mass 445g / m ² or more, thickness 0.6
A cloth of not less than mm is used as a base material. An aluminum foil having a thickness of 7 μm or more is adhered to the base material via an adhesive, or a resin treatment is performed on the base material surface so that the adhesive does not soak, and then the adhesive is applied. Transcribe

A cloth woven from a high heat-resistant glass fiber obtained by treating only the surface layer of the E glass fiber with an acid is generally prepared by using the E glass fiber cloth as a base material with hydrochloric acid or the like. The acid erosion distance of the part is 0.1-0.
An acid treatment is performed to a thickness of about 2 μm, and the heat resistance of E glass fiber itself exceeds 550 ° C., preferably about 800 ° C.
It has heat resistance of about ° C. However, the weaving method of the glass fiber cloth is not limited to the above-mentioned twill weave, and plain weave, satin weave, case weave, mosaic weave and the like can be used. The acid-treated high heat-resistant glass fiber cloth is subjected to an aluminum layer treatment on its outer surface in the same manner as the E glass fiber cloth.

A piano wire or a hard steel wire for maintaining the shape may be interposed between the inner joint cloth and the outer joint cloth.

[0010]

The outer joint cloth made of a cloth woven with a high heat-resistant glass fiber in which only the surface layer of the E glass fiber is acid-treated provides sufficient heat resistance, and a cloth woven with the E glass fiber. By using the inner joint cloth composed of the above, sufficient bending strength as a general air conditioning duct can be obtained.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a flexible joint for a duct according to the present invention; 1 and 2 show an example in which the flexible joint for a duct of the present invention is used for connection of a duct for general air conditioning. In the drawings, reference numeral 10 denotes a flexible joint for a duct of the present invention, which is connected via a duct flange 1. At the same time, it is attached using a duct flange 1 at an appropriate position between the ducts 3 suspended and supported by the suspension fittings 2.

As shown in detail in FIG. 2, the duct flexible joint 10 has a tubular joint cloth 1 having a substantially square cross section.
1 is a mass 44 woven from E glass fiber having a fiber diameter of 6 μm.
Inner / outer duplex in which an inner joint cloth 12 made of a 5 g / m ² twill cloth and an outer joint cloth 13 made of a cloth woven with a high heat-resistant glass fiber obtained by acid-treating only the surface layer of the E glass fiber are superposed. And a 7 μm-thick aluminum layer 20 is provided on each outer surface of the inner joint cloth 12 and the outer joint cloth 13. In the drawing, reference numeral 14 denotes a piano wire sewn and held between the inner joint cloth 12 and the outer joint cloth 13 with a sewing thread 15 in order to maintain the shape retention of the tubular joint cloth 11.

The tubular joint cloth 11 configured as described above is
An angle member 16 is attached to the edge by a rivet 17, and the angle member 16 and the duct flange 1 are abutted to each other and bolted with bolts 18, so that the duct flexible joint 10 is attached between the ducts 3. In the drawing, reference numeral 19 denotes a backing plate used for riveting and for maintaining a sealing property.

Next, as a comparative example, a flexible joint for a duct was constructed by replacing the constituent materials of the inner joint cloth 12 and the outer joint cloth 13 of the tubular joint cloth 11 of the above embodiment with the constituent materials shown in Table 1 below. And Comparative Examples 1 to 1 thus obtained.
4 and the heat resistance and the bending resistance of the flexible joints for ducts of the above examples were evaluated.

[0015]

[Table 1]

The heat resistance was evaluated at the so-called service limit temperature, and was evaluated at a temperature at which the tensile strength after the heating temperature was raised and treated for 30 minutes suddenly decreased. The tensile test method is performed according to JIS R3451 (asbestos cloth), and the specific measurement conditions are a sample 250 × 50 m
m, knob spacing 200mm, pulling speed 200 ± 20mm
/ Min. Regarding folding resistance, JISR3
420 (General Test Method for Glass Fibers) The evaluation was made based on the bending resistance (times) at normal temperature by the test method specified in 5.17. still,
Specific measurement conditions were a sample 15 × about 110 mm, a drag standard of 10 N (1 kgf), and a speed of about 175 times / min.

As is clear from Table 1, when both the inner joint cloth and the outer joint cloth are made of E glass fiber cloth as in Comparative Example 1, the fold resistance is excellent, but the heat resistance is poor.
When the inner joint cloth is made of E glass fiber cloth and the outer joint cloth is made of a high silicate glass fiber cloth in which the inside of the E glass fiber is acid-treated as in Comparative Example 2, the heat resistance is very excellent, but the folding resistance is high. In addition, when the inner joint cloth is made of E glass fiber cloth and the outer joint cloth is made of a rock wool blended cloth having excellent folding resistance as in Comparative Example 3, it is excellent in folding resistance. Lack of heat resistance due to rayon etc. blended in the inner joint fabric, as in the embodiment of the present invention,
Only when the glass fiber cloth is used and the outer joint cloth is a high heat-resistant glass fiber cloth, both heat resistance and folding resistance are excellent.

[0018]

As described above, according to the flexible joint for a duct of the present invention, even if a time lag occurs when switching to a smoke exhaust duct, the duct has heat resistance as a smoke exhaust duct during that time, and furthermore, a general air conditioning duct. In order to provide the durability as described above, it is possible to provide a flexible joint for a duct which can be used as a flexible joint for a general air-conditioning duct having extremely high safety.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a use state of an embodiment of a flexible joint for a duct of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Duct flange 2 Suspension metal fitting 3 Duct 10 Duct flexible joint 11 Cylindrical joint cloth 12 Inner joint cloth 13 Outer joint cloth 14 Piano wire 15 Sewing thread 16 Angle material 17 Rivets 18 Bolt 19 Backing plate 20 Aluminum layer

Claims (3)

(57) [Scope of request for utility model registration] 1. A flexible joint for a duct in which a tubular joint cloth is an inner and outer double joint cloth in which an inner joint cloth and an outer joint cloth are overlapped, wherein the inner joint cloth is woven of E glass fiber. The outer joint cloth is a cloth woven with a high heat-resistant glass fiber obtained by treating only the surface layer of E glass fiber with an acid, and the inner joint cloth and the outer joint cloth both have a thickness of 7 μm or more on the outer surface. A flexible joint for ducts provided with an aluminum layer. 2. The flexible joint for a duct according to claim 1, wherein a piano wire for maintaining a shape is interposed between the inner joint cloth and the outer joint cloth. 3. The flexible joint for a duct according to claim 1, wherein the aluminum layer is formed by attaching an aluminum foil or transferring an aluminum vapor-deposited layer.