JP2018066508A - Flexible joint for duct and manufacturing method of canvas used in flexible joint for duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a canvas to be constructed without flexibility, and minimize damage of the canvas generated by operation of an air fan.SOLUTION: A flexible joint 10 for a duct includes a canvas 11, and a flange 12 attached to both end parts of the canvas 11 in connection to the duct 1. The canvas 11 is formed into such a corrugated shape as to be able to expand/contract along a joint axis direction. The canvas 11 is configured to paste an aluminum foil or aluminum evaporation film to a fiber cloth, and is formed into such a corrugated shape as to be able to extract/contract along the joint axis direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a duct flexible joint and a canvas used for a duct flexible joint capable of preventing the canvas from being damaged as much as possible due to the influence of vibration generated by operating the blower, wind pressure generated by blowing, and the like. It relates to the manufacturing method.

  In recent years, various ducts arranged for the purpose of air conditioning, smoke exhaust, etc. inside buildings such as buildings are continuously connected using duct flexible joints and are arranged along the ceiling and walls of the building. Yes. This duct flexible joint includes a canvas and flanges attached to both ends of the canvas for connection to the duct (see Patent Document 1).

  This flexible joint for ducts absorbs vibrations and noises generated by the blower sending air when the building is deformed due to an earthquake, etc. The function of stopping the propagation, and the blower generates a slight vibration when the fan rotates in the initial operation, but has a function of preventing this vibration from being directly applied to the duct.

JP 2009-186155 A

  The canvas of this flexible joint for duct uses, for example, inorganic fibers including glass fibers. However, since the inorganic fibers are tough and hard as the fibers, they tend to have a low flexibility and a weak tendency to bend. For this reason, the canvas is supported by bending, and the canvas is repeatedly swollen or squeezed due to the influence of vibration generated by the operation of the blower and wind pressure generated by blowing (FIG. 7). ).

  During the initial operation of the blower, displacement occurs in the canvas due to operating vibrations, etc. (Fig. 8). For example, ducts are distorted due to earthquakes, etc., but these displacements are also absorbed by flexible joints. Is similar to the initial operation of the blower.

  The flexible joint for ducts functioning in this way is free of wrinkles when the canvas is bent and constructed evenly, as shown by the ideal cross-sectional curve in Fig. 9 (a). Although the occurrence of breakage at the toe portion is extremely small, as shown by the cross-sectional curve at the time of execution in FIG.

  When the duct flexible joint is constructed as shown in FIGS. 10 (a) and 10 (b), the operation of the blower affects the expansion and contraction due to vibration and air flow, and the bending is repeated. In this case, there is a high probability of bending at an acute angle, and there is a risk of damage at this portion (FIG. 10 (a)). For example, even if a small breakage occurs once, the breakage point further spreads, eventually resulting in a tear of the whole, causing the canvas to break, and the function as a flexible joint is lost.

  The present invention has been made to solve such a conventional problem, and can be applied without causing the canvas to bend, and can prevent damage to the canvas caused by the operation of the blower as much as possible. It is an object of the present invention to provide a duct flexible joint and a method for producing a canvas used for the duct flexible joint.

  In order to solve the above-described problems and achieve the object, the present invention is configured as follows.

The invention described in claim 1
A flexible joint for a duct including a canvas and flanges attached to both ends of the canvas for connection to the duct;
The canvas
A duct flexible joint characterized in that it is configured in a wavy shape that can expand and contract along the joint axial direction.

The invention described in claim 2
The canvas
For fiber cloth,
Bonding aluminum foil or aluminum vapor deposition film,
A duct flexible joint characterized in that it is configured in a wavy shape that can expand and contract along the joint axial direction.

The invention according to claim 3
A canvas manufacturing method for use in a duct flexible joint including a canvas and flanges attached to both ends of the canvas for connection to the duct,
Pull the fiber cloth,
Bonding aluminum foil or aluminum vapor deposition film to the fiber cloth,
The fiber cloth contracts by releasing the pulled state of the fiber cloth,
A canvas manufacturing method for use in a duct flexible joint, wherein the canvas is formed in a corrugated shape extending and contracting along a joint axial direction.

  With the above configuration, the present invention has the following effects.

  In the invention according to any one of claims 1 to 3, the canvas of the duct flexible joint is formed in a contracted wave shape along the joint axial direction, so that the canvas can be constructed without being bent. Therefore, it is possible to prevent damage to the canvas caused by the operation of the blower as much as possible.

It is a side view of the flexible joint for ducts. It is sectional drawing of a canvas. It is sectional drawing of the center part of the canvas. It is sectional drawing of the edge part of a canvas. It is a figure explaining the manufacturing method of the canvas used for the flexible joint for ducts. It is a figure explaining the action | operation of the flexible coupling for ducts. It is a figure which shows the state which the canvas act | operates under the influence of the vibration generate | occur | produced by operating a blower, the wind pressure etc. which generate | occur | produce by blowing. It is a figure which shows the state which a canvas displaces by the operating vibration etc. at the time of the initial operation of a fan. It is a figure explaining the principle which the canvas of the flexible joint for ducts breaks. It is a figure which shows the state which the canvas of the flexible joint for ducts breaks.

  Hereinafter, an embodiment of a flexible joint for duct and a method for producing a canvas used for the flexible joint for duct of the present invention will be described. The embodiment of the present invention shows the most preferable mode of the present invention, and the present invention is not limited to this.

(Flexible joint for duct)
A flexible joint for a duct according to this embodiment will be described with reference to FIGS. 1 is a side view of a duct flexible joint, FIG. 2 is a cross-sectional view of a canvas, FIG. 3 is a cross-sectional view of a center portion of the canvas, and FIG. 4 is a cross-sectional view of an end portion of the canvas.

  The duct flexible joint 10 includes a canvas 11 and frame-like flanges 12 attached to both ends of the canvas 1 for connection to the duct 1 for the purpose of air conditioning, smoke exhaust, etc. in a building such as a building. The various ducts 1 to be arranged are continuously connected using a duct flexible joint 10 and arranged along the ceiling or wall of the building.

  The canvas 11 is formed in a wave shape that can be expanded and contracted along the joint axial direction. As shown in FIG. 2, an aluminum foil or an aluminum vapor deposition film 112 is attached to the fiber cloth 110 via an adhesive 111. They are formed in a wavy shape that can expand and contract along the joint axial direction. The aluminum foil or the aluminum vapor deposition film 112 has leakage prevention performance.

  The fiber cloth 110 has stretchability and incombustibility, and for example, a special knitted fiber cloth is used. The fiber cloth 110 has stretchability, but the aluminum foil or the aluminum vapor deposition film 112 does not have stretchability. In the state where the fiber cloth 110 is stretched and stretched, the aluminum foil or the aluminum vapor-deposited film 112 is bonded together, and when the tension is released, the fiber cloth 110 shrinks, but the aluminum foil or the aluminum vapor-deposited film 112 is not stretchable. It is formed in a wavy shape that can be expanded and contracted.

  Since the canvas 11 is formed in a wavy shape that can be expanded and contracted, the canvas 11 can be expanded and contracted at the time of construction without being bent, and wrinkles that are caused by biased deflection can be eliminated. . Even if vibration or the like is applied to the canvas 11, the canvas 11 can be expanded and contracted to absorb the vibration and prevent the canvas 11 from being damaged.

  The canvas 11 is processed into a cylindrical shape by overlapping two fiber cloths 110 so that the aluminum foil or the aluminum vapor deposition film 112 is on the outer and inner surfaces, and the cylindrical fiber cloth 110 and the fiber cloth 110 are overlapped. For example, a piano wire 120 is inserted and fixed in between, and a deformation suppression measure is taken. The flange 12 is made of, for example, an equilateral angle steel called an angle flange. The flange 12 is applied to the end portion 11a of the cylindrical canvas 11, and the end portion 11a is sandwiched between the holding plates 13 and fixed with the rivets 14. Attached to the entrance and exit of the canvas 11, angle flanges of similar dimensions are also constructed on the duct 1 side, and they are joined together.

(Canvas manufacturing method)
A method of manufacturing a canvas used for the duct flexible joint 10 will be described with reference to FIG. In the method of manufacturing the canvas 11 according to this embodiment, for example, a fiber cloth 110 made of knitted material is pulled (FIG. 5A), a certain tension (pulling force) is applied to the fiber cloth 110, and the fiber cloth 110 is applied. The adhesive 111 is applied to the surface of the fiber cloth 110 in a state where the 110 is pulled and stretched (FIG. 5B). An aluminum foil or an aluminum vapor-deposited film 112 is bonded to the fiber cloth 110 in a stretched and stretched state via an adhesive 111 (FIG. 5C). When the bonding is completed, the fiber cloth 110 is released from the tension. When the fiber cloth 110 is released from the pulled state, the stretched fiber cloth 110 is shrunk, and the canvas 11 can be formed into a wave shape that can be stretched and shrunk along the joint axis direction (FIG. 5D).

  In this way, for example, a fiber cloth 110 made of a knit weave can be used to produce a stretchable canvas material without impairing the knit weave characteristics.

(Operation of flexible joint for duct)
The duct flexible joint 10 of this embodiment operates as shown in FIG. The various ducts 1 arranged for the purpose of air conditioning, smoke exhaust, etc. inside a building such as a building are continuously connected using a duct flexible joint 10 and arranged along the ceiling or wall of the building. However, the canvas 11 is constructed without bending and is formed in a wave shape that can be expanded and contracted along the joint axial direction (FIG. 6A).

  When the blower is operated, the canvas flexible joint 10 is repeatedly swelled or squeezed due to the influence of vibration generated by operating the blower, wind pressure generated by blowing air, and the like (FIG. 6B). )). During the initial operation of the blower, displacement occurs in the canvas 11 due to operating vibration or the like (FIG. 6C). For example, the duct is distorted due to an earthquake or the like, and the flexible joint 10 for ducts also absorbs the displacement. The movement of the canvas 11 at that time is similar to that during the initial operation of the blower.

  As described above, when the blower is in operation, the canvas 11 repeatedly swells and squeezes, and when the blower is in the initial operation, the canvas 11 is displaced, but the canvas 11 is constructed without being bent. Therefore, it is possible to absorb the deformation of the duct 1 and the vibration of the blower, and to prevent the canvas 11 from being damaged as much as possible.

  The present invention relates to a duct flexible joint for preventing the canvas from being damaged as much as possible due to the influence of vibration generated by the operation of the blown air, wind pressure generated by the blown air, and the method of manufacturing the canvas used for the duct flexible joint. It can be applied without causing the canvas to bend, and damage to the canvas caused by the operation of the blower can be prevented as much as possible.

DESCRIPTION OF SYMBOLS 1 Duct 10 Flexible joint for ducts 11 Canvas 12 Flange 14 Rivet 110 Fiber cloth 111 Adhesive 112 Aluminum foil or aluminum vapor deposition film 120 Piano wire

Claims (3)

A flexible joint for a duct including a canvas and flanges attached to both ends of the canvas for connection to the duct;
The canvas
A flexible joint for ducts, characterized in that it has a wave-like configuration that can be expanded and contracted along the joint axial direction. The canvas
For fiber cloth,
Bonding aluminum foil or aluminum vapor deposition film,
A flexible joint for ducts, characterized in that it has a wave-like configuration that can be expanded and contracted along the joint axial direction. A canvas manufacturing method for use in a duct flexible joint including a canvas and flanges attached to both ends of the canvas for connection to the duct,
Pull the fiber cloth,
Bonding aluminum foil or aluminum vapor deposition film to the fiber cloth,
The fiber cloth contracts by releasing the pulled state of the fiber cloth,
A method of manufacturing a canvas used for a duct flexible joint, wherein the canvas is formed in a corrugated shape extending and contracting along a joint axial direction.

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