JP2022073109A - Inner cover for flexible duct and manufacturing method thereof - Google Patents

Inner cover for flexible duct and manufacturing method thereof Download PDF

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JP2022073109A
JP2022073109A JP2020182888A JP2020182888A JP2022073109A JP 2022073109 A JP2022073109 A JP 2022073109A JP 2020182888 A JP2020182888 A JP 2020182888A JP 2020182888 A JP2020182888 A JP 2020182888A JP 2022073109 A JP2022073109 A JP 2022073109A
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inner body
flexible duct
reduced diameter
inner cover
diameter
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隆 戸田
Takashi Toda
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TYLON CORP
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TYLON CORP
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Abstract

To provide an inner cover for a flexible duct capable of reducing a diameter without using another member such as a chamber, and a manufacturing method thereof.SOLUTION: The present invention is a cylindrical inner cover 1 for a flexible duct, which has a retaining part 4 in which edge parts 5, 5 of strips 3 stacked in a spiral manner are caulked and fastened. The inner cover 1 forms a reduced diameter part 6 formed so that the retaining part 4 protrudes in an axial direction of the spiral. The reduced diameter part 6 can reduce a diameter without using another member such as a chamber.SELECTED DRAWING: Figure 1

Description

本発明は不織布などからなる螺旋状の本体を留部によりかしめて円筒状に固定したフレキシブルダクトの内被体に関する発明である。 The present invention relates to an inner cover of a flexible duct in which a spiral main body made of a non-woven fabric or the like is crimped by a retaining portion and fixed in a cylindrical shape.

従来から空調ダクトとして、不織布からなるフレキシブルダクトがある。このフレキシブルダクトとして、特許文献１に示す製造方法により縁部を重ね合わせて不織布を螺旋状に巻き回して、留部のカシメ部により円筒状に固定したものがある。この製造方法により製造したフレキシブルダクトは重ね合わせた両方の縁部がダクトの外面側に位置して、内ヒレとならないことによりダクトの内部を流れる空気の抵抗を軽減している。 Conventionally, as an air conditioning duct, there is a flexible duct made of non-woven fabric. As this flexible duct, there is a duct in which the edges are overlapped by the manufacturing method shown in Patent Document 1, the nonwoven fabric is spirally wound, and the non-woven fabric is fixed in a cylindrical shape by the caulking portion of the retaining portion. In the flexible duct manufactured by this manufacturing method, both the overlapped edges are located on the outer surface side of the duct, and the resistance of the air flowing inside the duct is reduced by not forming an inner fin.

特開２０１９－０４９４０１号公報Japanese Unexamined Patent Publication No. 2019-049401

フレキシブルダクトからなる空調ダクトは吹き出し口やダクト、チャンバーなどに接続して用いられる。既設の吹き出し口などに接続する場合、これら既設物の内径と空調ダクトの内径（フレキシブルダクトの径）とが異なることがあり、接続するには双方の径にそれぞれ対応した端部を有する継手を介在させる必要がある。双方の径の差が大きいと、流動方向（継手の軸方向）において短い距離で大きく径を変動させることとなり、接続部分（継手）における圧力損失が大きくなり、大型で高出力な送風機が必要となる。また径の差（径の変動）が大きい継手を用いると、圧力損失の原因の一つである空気抵抗の増大化により振動や騒音を生じやすくなる。 An air conditioning duct consisting of a flexible duct is used by connecting to an outlet, a duct, a chamber, or the like. When connecting to an existing outlet, etc., the inner diameter of these existing objects and the inner diameter of the air conditioning duct (the diameter of the flexible duct) may differ. Need to intervene. If the difference between the two diameters is large, the diameter will fluctuate greatly over a short distance in the flow direction (axial direction of the joint), and the pressure loss at the connection part (joint) will increase, requiring a large, high-output blower. Become. Further, if a joint having a large diameter difference (variation in diameter) is used, vibration and noise are likely to occur due to an increase in air resistance, which is one of the causes of pressure loss.

そこで、チャンバー等の別部材を用いずに縮径することができるフレキシブルダクト用内被体及びその製造方法を提供することを目的とする。 Therefore, it is an object of the present invention to provide an inner cover for a flexible duct and a method for manufacturing the same, which can reduce the diameter without using a separate member such as a chamber.

本発明は、上記課題に鑑み、螺旋状に重ね合わせた帯状体の縁部をかしめて留めた留部を有し、円筒状としたフレキシブルダクト用内被体であって、前記内被体は、前記留部を内被体長手方向に向けて突出するように形成した縮径部を形成したことを特徴とする。 In view of the above problems, the present invention is a cylindrical inner body for a flexible duct having a retaining portion in which the edges of spirally overlapped strips are crimped and fastened, and the inner body is a cylindrical inner body. It is characterized in that a reduced diameter portion is formed so that the retaining portion protrudes in the longitudinal direction of the inner body.

また、内被体長手方向に向けて突出するように形成した縮径部は、突出方向となる２つの突出辺と、該２つの突出辺を繋いで前記縮径部の螺旋方向に向けて所定の長さを有する先端辺とからなる凸状形状であることが好ましい。 Further, the reduced diameter portion formed so as to project in the longitudinal direction of the inner body is predetermined in the spiral direction of the reduced diameter portion by connecting the two protruding sides in the protruding direction and the two protruding sides. It is preferable that the shape is a convex shape including the tip side having the length of.

また、２つの突出辺は、一方に螺旋状の円周辺を屈曲する２つの第１屈曲部と、他方に前記突出辺から先端辺を形成するための２つの第２屈曲部とを有し、前記２つの突出辺は、第２屈曲部間の間隔が第１屈曲部間の長さよりも短くなるように各々が中央寄りに傾斜する傾斜辺からなることが好ましい。 Further, the two protruding sides have two first bending portions that bend around a spiral circle on one side, and two second bending portions for forming a tip side from the protruding side on the other side. It is preferable that the two protruding sides are each inclined side inclined toward the center so that the distance between the second bent portions is shorter than the length between the first bent portions.

本発明は、円筒状にしたフレキシブルダクト用内被体を縮径する方法であって、螺旋状に重ね合わせた帯状体の縁部に線材と鋼材とを配し、前記線材と前記鋼材とをかしめて留部として円筒状のフレキシブルダクト用内被体を成形する内被体製造工程と、前記内被体製造工程で製造された内被体の外側から、留部の円周辺を支持しつつ先端に所定幅の押圧面を有する押圧具を押し付けることにより、凸状形状の縮径部を形成する縮径部形成工程と、を有することを特徴とする。 The present invention is a method of reducing the diameter of a cylindrical inner body for a flexible duct, in which a wire and a steel material are arranged at the edge of a strip-shaped body that is spirally overlapped, and the wire and the steel material are combined. While supporting the circumference of the circle of the retaining portion from the outside of the inner covering manufactured in the inner covering manufacturing process of forming a cylindrical inner body for a flexible duct as a retaining portion and the inner covering manufacturing process. It is characterized by having a diameter-reduced portion forming step of forming a convex-shaped reduced-diameter portion by pressing a pressing tool having a pressing surface having a predetermined width on the tip.

請求項１に記載の発明により、留部を突出変形させることで狭径部を形成することで、漸次的で緩やかに径を変更して圧力損失を抑えたフレキシブルダクト用内被体を提供することができる。さらに、内被体を完成させた後で狭径部を形成することが可能になり、設置状況に応じて個別に対応できるフレキシブルダクト用内被体を提供することが可能になる。 According to the first aspect of the present invention, there is provided an inner body for a flexible duct in which a narrow diameter portion is formed by projecting and deforming a retaining portion to gradually and gradually change the diameter to suppress pressure loss. be able to. Further, it becomes possible to form a narrow diameter portion after the inner body is completed, and it becomes possible to provide an inner body for a flexible duct that can be individually handled according to the installation situation.

請求項２に記載の発明により、縮径部の形態を凸状体とすることで、先端辺が螺旋状に形成された円周辺と同方向となり、送風時の圧力損失を低くし、縮径部が存在してもダクト内の通風に影響が発生し難いフレキシブルダクト用内被体を提供することができる。 According to the invention of claim 2, by making the shape of the reduced diameter portion a convex body, the tip side is in the same direction as the periphery of the spirally formed circle, the pressure loss at the time of blowing is reduced, and the diameter is reduced. It is possible to provide an inner cover for a flexible duct in which the ventilation in the duct is less likely to be affected even if the portion is present.

請求項３に記載の発明により、縮径部の形成により帯状体に加わる負荷を少なくして、内被体が破損し難いフレキシブルダクト用内被体を提供することができる。 According to the third aspect of the present invention, it is possible to provide an inner body for a flexible duct in which the load applied to the band-shaped body due to the formation of the reduced diameter portion is reduced and the inner body is less likely to be damaged.

請求項４に記載の発明により、本発明のフレキシブルダクト用内被体を縮径することができる縮径部を容易に形成することができる。すなわち従来ではダクト自体を縮径することは極めて難しかったが、内被体をいったん完成した後で縮径部を外部より形成することが可能となり、容易かつ量産的に縮径したダクトを提供することが可能になる。 According to the invention of claim 4, it is possible to easily form a reduced diameter portion capable of reducing the diameter of the inner body for a flexible duct of the present invention. That is, in the past, it was extremely difficult to reduce the diameter of the duct itself, but it is possible to form a reduced diameter portion from the outside after the inner body is completed once, and a duct with a reduced diameter can be easily and mass-produced. Will be possible.

本発明の実施形態に係るフレキシブルダクト用内被体の側面図である。It is a side view of the inner body for a flexible duct which concerns on embodiment of this invention. 図１の領域Ａを拡大した縮径部周辺の一部拡大側面図である。It is a partially enlarged side view around the reduced diameter portion which enlarged the area A of FIG. 本発明の縮径部を製造するための加工装置の斜視図である。It is a perspective view of the processing apparatus for manufacturing the reduced diameter part of this invention. 本発明の縮径部を製造するための加工装置の正面図である。It is a front view of the processing apparatus for manufacturing the reduced diameter part of this invention. 加工装置に内被体をセットした状態を示す斜視図である。It is a perspective view which shows the state which the inner body is set in the processing apparatus. 加工装置により縮径部を製造する状態を示す一部拡大正面図であり、（ａ）は加工前、（ｂ）は加工後の状態を示す。It is a partially enlarged front view which shows the state which a reduced diameter part is manufactured by a processing apparatus, (a) shows the state before processing, (b) shows the state after processing.

本発明の実施形態について、図面に基づいて詳細に説明する。本発明は以下の形態に限定されるものではなく、本発明の要旨の範囲で種々の変形、付加等が可能である。なお、本実施形態において、内被体１の長手方向（螺旋の軸方向）を内被体長手方向とし、内被体１の表面を留部４が螺旋状に旋回している方向を螺旋方向とする。特に縮径部６の螺旋方向とは縮径部６の位置で留部４が本来螺旋していた方向としている。 Embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following forms, and various modifications, additions, and the like can be made within the scope of the gist of the present invention. In the present embodiment, the longitudinal direction of the inner body 1 (the axial direction of the spiral) is the longitudinal direction of the inner body, and the direction in which the retaining portion 4 spirally swirls on the surface of the inner body 1 is the spiral direction. And. In particular, the spiral direction of the reduced diameter portion 6 is the direction in which the retaining portion 4 originally spirals at the position of the reduced diameter portion 6.

本発明のフレキシブルダクト用内被体１は、空調ダクトとして用いられるフレキシブルダクトの内部の芯として用いられる。フレキシブルダクトの完成体は、図示しないが、フレキシブルダクト用内被体１の外表面にガラスウールを巻き付け、さらにオレフィン系樹脂からなる外皮体を巻き付けて成型される。図１に示すように、本実施形態の内被体１は、帯状体３を中空の螺旋状に巻きつけ、帯状体３、３が重なる縁部５、５を固定する留部４を基本構成としている。 The inner body 1 for a flexible duct of the present invention is used as an inner core of a flexible duct used as an air conditioning duct. Although not shown, the finished flexible duct is formed by winding glass wool around the outer surface of the inner body 1 for the flexible duct, and further winding an outer skin made of an olefin resin. As shown in FIG. 1, the inner body 1 of the present embodiment has a basic configuration of a retaining portion 4 in which the strip-shaped body 3 is wound in a hollow spiral shape and the edge portions 5 and 5 on which the strip-shaped bodies 3 and 3 overlap are fixed. It is supposed to be.

帯状体３は、円筒状の内被体１の壁面となるものであって、不織布、布帛又は紙類を基材とし、これに合成樹脂によるコーティングを施した所定幅の帯体により形成される。帯状体３を螺旋状に縁部５、５を重ね合わせて巻き回して円筒状に形成する。なお、帯状体３はフィルム乃至シートとし、巻き回した円筒の断面が円形となるようにしている。 The strip 3 is a wall surface of a cylindrical inner cover 1, and is formed of a strip having a predetermined width, which is made of a non-woven fabric, cloth, or paper as a base material and coated with a synthetic resin. .. The strip 3 is spirally formed by overlapping the edges 5 and 5 and winding the strip 3 into a cylindrical shape. The strip 3 is made of a film or a sheet so that the wound cylinder has a circular cross section.

帯状体３の縁部５、５を重ね合わせた部分を留部４により保持して円筒状に固定している。留部４は、図示しないが帯状体３の外周に当接して縁部５、５に沿うように螺旋状に巻き付ける鋼線状の芯材と金属薄板とからなる。縁部５、５に線材（芯材）を沿わせ、金属薄板を内側に重ね合わせるようにし、両方の縁部５、５を挟み込み芯材により内側に抜け止めつつ内側に曲げてＣ字状にするカシメ工程を経ることによって、両方の縁部５、５を留め固定している。 The portion where the edges 5 and 5 of the strip 3 are overlapped is held by the retaining portion 4 and fixed in a cylindrical shape. Although not shown, the retaining portion 4 is composed of a steel wire-shaped core material and a thin metal plate that abut on the outer periphery of the strip-shaped body 3 and are spirally wound along the edge portions 5 and 5. A wire rod (core material) is placed along the edges 5 and 5, and the metal thin plates are overlapped inward. Both edges 5 and 5 are sandwiched and bent inward while being prevented from coming off inward by the core material to form a C shape. By going through the caulking process, both edges 5, 5 are fastened and fixed.

内被体１は、留部４のカシメ工程により、帯状体３の縁部５、５をダクトの外面側に折り返して外方（外面側）の縁部５に重ね合わせることによって、両方の縁部５、５を内被体１の外面側に配置している。この両方の縁部５、５が重ね合わされて外面側に若干突出する部分をヒレと呼んでいる。なお、別の実施形態として、縁部５、５（ヒレ）が内被体１の内側に突出するようにカシメ工程を行ってもよい。 The inner body 1 is formed by folding the edges 5 and 5 of the strip 3 toward the outer surface side of the duct and superimposing them on the outer (outer surface side) edge 5 by the caulking process of the retaining portion 4. The portions 5 and 5 are arranged on the outer surface side of the inner cover 1. The portion where both of the edges 5 and 5 are overlapped and slightly protrudes toward the outer surface is called a fin. As another embodiment, the caulking step may be performed so that the edges 5, 5 (fillets) protrude inward of the inner body 1.

留部４は、図１に示すように、螺旋方向に所定の間隔を置いて外周に一または複数の縮径部６、６が形成される。縮径部６は、かしめた（カシメ工程を経た）留部４から、内被体１の長手方向である内被体長手方向に向けて凸となるように突出するよう屈曲させて形成される。本実施形態において、縮径部の凸となるために内被体長手方向に向けて突出する方向と、留部４から外方に位置する縁部５、５（ヒレ）の突出方向を一致させている。この一致により圧力損失を低くし、破れにくい内被体とすることができる。この螺旋の軸方向に凸となるとは、長手方向を有する円状形状の内被体１のうち突出方向を長手方向に一致させることをいう。 As shown in FIG. 1, the retaining portion 4 is formed with one or a plurality of reduced diameter portions 6 and 6 on the outer periphery thereof at predetermined intervals in the spiral direction. The reduced diameter portion 6 is formed by bending from the crimped (caulked) retaining portion 4 so as to project so as to be convex in the longitudinal direction of the inner cover 1, which is the longitudinal direction of the inner cover 1. .. In the present embodiment, the direction in which the diameter-reduced portion is convex so as to project in the longitudinal direction of the inner body is matched with the projecting direction of the edge portions 5, 5 (fillets) located outward from the retaining portion 4. ing. By this agreement, the pressure loss can be reduced and the inner body can be made hard to tear. Being convex in the axial direction of the spiral means that the protruding direction of the circular inner body 1 having the longitudinal direction coincides with the longitudinal direction.

螺旋状の留部４のうち一部を縮径部６で一方向に凸となるように形成することで、留部４にかしめられて保持された帯状体３も変形する。この変形において、内被体１の円周が縮まって縮径される。内被体１は、螺旋方向において同一の縮径部６を複数配置することにより、その配置数により縮径されるから、並ぶ間隔（個数）を漸次的に狭めることによって漸次的に縮径されたスパイラル状となる。そして縮径部６を等間隔に配置することにより、縮径した寸法を維持した螺旋状となる。 By forming a part of the spiral retaining portion 4 so as to be convex in one direction at the reduced diameter portion 6, the band-shaped body 3 crimped and held by the retaining portion 4 is also deformed. In this deformation, the circumference of the inner body 1 is shrunk and the diameter is reduced. Since the inner cover 1 is reduced in diameter according to the number of arrangements by arranging a plurality of the same diameter-reduced portions 6 in the spiral direction, the diameter is gradually reduced by gradually narrowing the line-up interval (number). It becomes a spiral shape. By arranging the reduced diameter portions 6 at equal intervals, a spiral shape that maintains the reduced diameter is formed.

本実施形態の縮径部６の凸状の突出方向は、縁部５、５（ヒレ）の外側突出方向と一致する方向であり、縮径部６は凸となる先端部分を縮径部の螺旋方向に沿うように直線状（後述の先端辺８）としている。 The convex protruding direction of the reduced diameter portion 6 of the present embodiment is a direction corresponding to the outward protruding direction of the edge portions 5, 5 (fins), and the reduced diameter portion 6 has a convex tip portion of the reduced diameter portion. It is linear (tip side 8 described later) along the spiral direction.

縮径部６の具体的形態を説明するため、縮径部６の部分のみを一部拡大した図２を示す。留部４のうちダクトの螺旋状の円周を形成する円周辺４ａがあり、この円周辺４ａを屈曲する一対の第１屈曲部９、９と、第１屈曲部９、９それぞれから内被体長手方向に伸びる一対の突出辺７、７と、突出辺７、７それぞれの先端部分から向かい合うように屈曲させた一対の第２屈曲部１０、１０と、両方の第２屈曲部１０、１０から螺旋に沿うように直線形状に伸び両方の突出辺７、７を繋ぐ先端辺８とからなる。先端辺８は縮径部の螺旋方向に向かって伸びる所定長さを有するものである。なお、縮径部６の突出方向が内被体長手方向に向けて形成されること、先端辺８が縮径部６の螺旋方向に向けて形成されることは、所定の誤差等を含むものであって、方向を厳密に一致させるものではない。 In order to explain the specific form of the reduced diameter portion 6, FIG. 2 is shown in which only the reduced diameter portion 6 is partially enlarged. Among the retaining portions 4, there is a circle periphery 4a forming a spiral circumference of the duct, and a pair of first bending portions 9 and 9 for bending the circle periphery 4a and an inner cover from each of the first bending portions 9 and 9. A pair of protruding sides 7 and 7 extending in the longitudinal direction of the body, a pair of second bent portions 10 and 10 bent so as to face each other from the tip portions of the protruding sides 7 and 7, and both second bent portions 10 and 10. It extends in a straight line along a spiral from the top and consists of a tip side 8 connecting both protruding sides 7 and 7. The tip side 8 has a predetermined length extending in the spiral direction of the reduced diameter portion. It should be noted that the fact that the protruding direction of the reduced diameter portion 6 is formed toward the longitudinal direction of the inner body and that the tip end side 8 is formed toward the spiral direction of the reduced diameter portion 6 includes predetermined errors and the like. However, the directions are not exactly the same.

突出辺７、７は、内被体長手方向より若干内向きに傾斜して伸びる直線状であって、一つの縮径部６を構成する両側の突出辺６、６の各々が中央寄りに傾斜する傾斜辺として形成される。突出辺７、７は先端辺８へ向けて２０ｍｍ程度の長さ寸法を有する。先端辺８の長さ寸法は１０ｍｍ程度としている。突出辺７、７の突出長さは螺旋のピッチの４分の１程度としている（図１参照）。 The protruding sides 7 and 7 are linear shapes extending slightly inward from the longitudinal direction of the inner body, and each of the protruding sides 6 and 6 on both sides constituting one reduced diameter portion 6 is inclined toward the center. It is formed as an inclined side. The protruding sides 7 and 7 have a length dimension of about 20 mm toward the tip side 8. The length of the tip side 8 is about 10 mm. The protruding lengths of the protruding sides 7 and 7 are about one-fourth of the pitch of the spiral (see FIG. 1).

２つの第１屈曲部９、９間の間隔Ｘ１より、２つの第２屈曲部１０、１０間の間隔Ｘ２の方が短くなるように、突出辺７、７は中央寄りであって互いに向けて傾斜している。このように、本実施形態の縮径部６は台形状に形成されている。なお、その他の実施形態として、突出辺７、７の先端側から先端辺８が湾曲した形態であってもよく、第１屈曲部９、９と第２屈曲部１０、１０の屈曲が比較的大きく湾曲するものであってもよい。 The protruding sides 7 and 7 are closer to the center and face each other so that the distance X2 between the two second bent portions 10 and 10 is shorter than the distance X1 between the two first bent portions 9 and 9. It is tilted. As described above, the reduced diameter portion 6 of the present embodiment is formed in a trapezoidal shape. As another embodiment, the tip side 8 may be curved from the tip side of the protruding sides 7 and 7, and the first bent portions 9 and 9 and the second bent portions 10 and 10 are relatively bent. It may be greatly curved.

突出辺７、７が中央寄りであって互いに向けて傾斜することにより、縮径部６の成型により縁部５、５に形成されているヒレが引き込まれたり、かしめた留部からはずれにくいようにしている。また、ダクト内に通風した場合に、一部に圧力が集中しないように屈曲部を直角に曲げないようにしている。 Since the protruding sides 7 and 7 are closer to the center and are inclined toward each other, the fins formed on the edges 5 and 5 due to the molding of the reduced diameter portion 6 are not easily pulled in or come off from the crimped retaining portion. I have to. In addition, when the duct is ventilated, the bent portion is not bent at a right angle so that the pressure is not concentrated on a part of the duct.

次に、内被体１に縮径部６を形成する加工装置２０を図面に基づいて説明する。 Next, the processing apparatus 20 for forming the reduced diameter portion 6 on the inner body 1 will be described with reference to the drawings.

加工装置２０は図３に示すように、留部４を保持する保持台２１と、梃子の原理により回動して保持台２１に出没する長尺な棒板からなる押圧具２２と、押圧具２２を回動させる駆動部２３とからなる。加工装置２０は保持台２１に保持した留部４の一部を押圧具２２により押圧して曲げ加工を加えて縮径部６を形成し、内被体１を縮径するものである。駆動部２３は周知の駆動手段であって、本実施形態ではエアピストンからなるが、油圧式ピストンやモータ式クランクなどであってもよく特に限定されない。 As shown in FIG. 3, the processing apparatus 20 includes a holding table 21 for holding the retaining portion 4, a pressing tool 22 composed of a long bar plate that rotates according to the principle of leverage and appears and disappears on the holding table 21, and a pressing tool. It includes a drive unit 23 that rotates 22. The processing device 20 presses a part of the retaining portion 4 held on the holding table 21 by the pressing tool 22 to perform bending to form the reduced diameter portion 6 and reduce the diameter of the inner body 1. The drive unit 23 is a well-known drive means, and is composed of an air piston in the present embodiment, but may be a hydraulic piston, a motor crank, or the like, and is not particularly limited.

押圧具２２は長手方向の一端部が駆動部２３に接続され、他端部に下方に突出した押圧部２４を有し、長手方向の中間部に下方に突出して梃子の支点となる支持軸２５に支持された支持部２６とを有し、Ｆ字形状としている。押圧部２４は、先端に幅方向に所定の長さを有する押圧面を有するもので、他端の駆動部２３により上下移動が可能となる。 The pressing tool 22 has a pressing portion 24 having one end in the longitudinal direction connected to the driving portion 23 and protruding downward at the other end, and the supporting shaft 25 protruding downward in the middle portion in the longitudinal direction to serve as a fulcrum of the lever. It has a support portion 26 supported by the sword and has an F-shape. The pressing portion 24 has a pressing surface having a predetermined length in the width direction at the tip thereof, and can be moved up and down by the driving portion 23 at the other end.

保持台２１は上板体２７と平行する下板体２８の上下二段からなり、押圧部２４の移動方向に直交して上板体２７の板面を配置している。保持台２１は図４に示すように、上下板体２７、２８の間に形成され、正面及び下板体２８の幅方向に開口したガイドスリット３０と、下板体２８の幅方向の中央に形成され、板面に直交して正面及び上下に開口する加工溝３１とを有している。 The holding table 21 is composed of two upper and lower stages of the lower plate body 28 parallel to the upper plate body 27, and the plate surface of the upper plate body 27 is arranged orthogonal to the moving direction of the pressing portion 24. As shown in FIG. 4, the holding table 21 is formed between the upper and lower plates 27 and 28, and has a guide slit 30 opened in the width direction of the front surface and the lower plate 28 and a center in the width direction of the lower plate 28. It is formed and has a machined groove 31 that opens in the front surface and vertically at right angles to the plate surface.

ガイドスリット３０は図５、６に示すように、上下方向の寸法を留部４に帯状体３の厚さを加えた長さとほぼ同じとしている。ガイドスリット３０は正面側から留部４を差し入れることにより、上下方向から留部４を加工位置に支持する。 As shown in FIGS. 5 and 6, the guide slit 30 has a vertical dimension substantially the same as the length obtained by adding the thickness of the strip 3 to the retaining portion 4. The guide slit 30 supports the retaining portion 4 at the processing position from the vertical direction by inserting the retaining portion 4 from the front side.

加工溝３１はガイドスリット３０に直交して、上板体２７及び下板体２８に貫通して形成され、押圧部２４を上下に移動自在としている。加工溝３１は、上板体２７側に形成される上部３３と、下板体２８側に形成される下部３４とからなる。上部３３は幅方向の寸法が押圧部２４の幅方向の寸法とほぼ同じまたは若干長く、押圧部２４を上部３３に接触させずに移動自在としている。 The machined groove 31 is formed so as to penetrate the upper plate body 27 and the lower plate body 28 at right angles to the guide slit 30, and the pressing portion 24 is movable up and down. The machined groove 31 includes an upper portion 33 formed on the upper plate 27 side and a lower portion 34 formed on the lower plate 28 side. The width direction of the upper portion 33 is substantially the same as or slightly longer than the width direction of the pressing portion 24, and the pressing portion 24 is movable without contacting the upper portion 33.

下部３４は幅方向の寸法が上部３３の幅方向の寸法より長く、移動する押圧部２４の両板面との間（左右両側）にそれぞれ広い隙間Ｓを有している（図６参照）。この左右の隙間Ｓはそれぞれ幅方向の寸法がガイドスリット３０の上下方向の寸法とほぼ同じとし、加工時に留部４及び帯状体３（縮径部６）を収容可能としている。 The lower portion 34 has a width direction longer than the width direction dimension of the upper portion 33, and has wide gaps S between the moving pressing portions 24 and both plate surfaces (left and right sides) (see FIG. 6). The width direction of each of the left and right gaps S is substantially the same as the vertical dimension of the guide slit 30, and the retaining portion 4 and the strip-shaped body 3 (diameter-reduced portion 6) can be accommodated during processing.

押圧部２４は無負荷状態で加工溝３１の上部３３に位置し、駆動部２３により押圧具２２が回動するとガイドスリット３０を横切り、さらに回動すると降下して下部３４に位置する。最も回動した最負荷状態の押圧部２４は下端部が下板体２８の上面より低く位置する。 The pressing portion 24 is located in the upper portion 33 of the machined groove 31 in a no-load state, and when the pressing portion 22 is rotated by the driving portion 23, it crosses the guide slit 30, and when it is further rotated, it descends and is located in the lower portion 34. The lower end of the most rotated pressing portion 24 in the most loaded state is located lower than the upper surface of the lower plate 28.

次に、本実施形態の内被体１を製造する方法を説明する。まずは、一般的な内被体１を製造する。内被体１は、マンドレルと呼ばれる専用の製造機械により、縁部５、５を重ねつつ帯状体３、３を螺旋状に巻き付けていく。このときに、重ね合わせた縁部５、５の一方表面に線材を沿わせ、他表面に留部４の外面となる金属薄板を沿わせていく。そして、金属薄板の幅を狭めるように屈曲させて、縁部５、５と線材とを抱きかかえるように成形してかしめる。このようにして、通常の円筒状の内被体１が完成する。 Next, a method of manufacturing the inner body 1 of the present embodiment will be described. First, a general inner body 1 is manufactured. The inner body 1 spirally winds the strips 3 and 3 while overlapping the edges 5 and 5 by a dedicated manufacturing machine called a mandrel. At this time, the wire rod is placed along one surface of the overlapped edge portions 5 and 5, and the metal thin plate serving as the outer surface of the retaining portion 4 is placed along the other surface. Then, the metal thin plate is bent so as to narrow the width, and the edges 5 and 5 and the wire rod are formed and crimped so as to be held. In this way, the normal cylindrical inner body 1 is completed.

上記で説明した加工装置２０を用いて、内被体１の縮径部６を形成する。まず、図５に示すように、加工装置２０のガイドスリット３０に、留部４（円周辺４ａ）を差し入れる。このように、内被体１は巻き付けられた帯状体３、３の外表面から留部４が若干突出しており、なおかつ帯状体３が比較的柔らかな素材から形成されていることから、ガイドスリット３０に挿入することが可能である。 The reduced diameter portion 6 of the inner body 1 is formed by using the processing apparatus 20 described above. First, as shown in FIG. 5, the retaining portion 4 (circular periphery 4a) is inserted into the guide slit 30 of the processing apparatus 20. As described above, since the retaining portion 4 slightly protrudes from the outer surface of the wound strips 3 and 3 and the strips 3 are formed of a relatively soft material, the inner cover 1 is a guide slit. It is possible to insert it in 30.

図６（ａ）、（ｂ）に示すように、ガイドスリット３０に留部４を挿入することで、加工溝３１を横切る部分で縮径部６を形成し、加工溝３１以外のガイドスリット挿入部分（円周辺４ａ）は、上板体２７及び下板体２８で保持される。この状態で、駆動部２３により押圧具２２を回動させて押圧部２４を降下させることにより、円周辺４ａから第１屈曲部９、９、第２屈曲部１０、１０が形成されるように屈曲され、突出辺７、７と先端辺８とを有する台形状の縮径部６を形成することができる。 As shown in FIGS. 6A and 6B, by inserting the retaining portion 4 into the guide slit 30, a reduced diameter portion 6 is formed at a portion crossing the machined groove 31, and a guide slit other than the machined groove 31 is inserted. The portion (circle periphery 4a) is held by the upper plate body 27 and the lower plate body 28. In this state, the pressing tool 22 is rotated by the driving unit 23 to lower the pressing unit 24 so that the first bending portions 9, 9 and the second bending portions 10 and 10 are formed from the circle periphery 4a. It can be bent to form a trapezoidal reduced diameter portion 6 having protruding sides 7 and 7 and a tip side 8.

このようにして製造された縮径した内被体１にガラスウール、外皮体を巻き付けると、縮径したフレキシブルダクトを製造することができる。なお、上記製造方法は内被体１を外部から縮径部６、６を適宜製造することができるものであるから、いったん縮径してさらに拡径する内被体１を製造することもできる。この場合、最大径の内被体を製造したうえで、漸次的に縮径する部分を複数個所形成することで形成することも可能であり、複雑な変化をする径からなるフレキシブルダクトを製造することが可能になる。 When the glass wool and the outer skin are wound around the reduced diameter inner body 1 manufactured in this manner, a reduced diameter flexible duct can be manufactured. In addition, since the above-mentioned manufacturing method can appropriately manufacture the diameter-reduced portions 6 and 6 from the outside of the inner body 1, it is also possible to manufacture the inner body 1 whose diameter is once reduced and the diameter is further expanded. .. In this case, it is also possible to manufacture an inner body with the maximum diameter and then form a plurality of gradually reducing diameter portions, and to manufacture a flexible duct having a diameter that changes in a complicated manner. Will be possible.

また、本実施形態の各々縮径部６、６は、内被体１を周方向に約１９．５ｍｍを縮める。内被体１の直径（中心径）は、５０ｍｍ単位で製造されていることが多く、１５０、２００、２５０、３００、３５０のタイプがある。例えば中心径１５０ｍｍの留部４の一回りの螺旋長さ（内径周長）は５０２．４ｍｍとなり、縮径した後の中心径を１００ｍｍにしたい場合の一回りの螺旋長さ（狙い周長）は３４５．４ｍｍとなる。差分は１５７ｍｍとなり、１９．５ｍｍを縮める縮径部６、６を８か所形成すると、５０ｍｍの縮径が可能となる。その他のタイプを計算したところ、下表１のとおりいずれも１９．５ｍｍを縮める縮径部６、６を８か所形成すれば、５０ｍｍの縮径ができる。そのため、簡単な構成、かつ、方法で、所定の縮径をすることができるフレキシブルダクト用内被体１を提供することが可能になる。 Further, each of the reduced diameter portions 6 and 6 of the present embodiment shrinks the inner body 1 by about 19.5 mm in the circumferential direction. The diameter (center diameter) of the inner body 1 is often manufactured in units of 50 mm, and there are 150, 200, 250, 300, and 350 types. For example, the one-round spiral length (inner diameter circumference) of the retaining portion 4 having a center diameter of 150 mm is 502.4 mm, and the one-round spiral length (target circumference) when the center diameter after diameter reduction is desired to be 100 mm. Is 345.4 mm. The difference is 157 mm, and if the diameter-reduced portions 6 and 6 that shrink 19.5 mm are formed at eight locations, a diameter reduction of 50 mm becomes possible. As a result of calculating other types, as shown in Table 1 below, if the diameter-reduced portions 6 and 6 that shrink 19.5 mm are formed at eight places, a diameter reduction of 50 mm can be obtained. Therefore, it becomes possible to provide the inner cover 1 for a flexible duct that can have a predetermined diameter reduction by a simple structure and a method.

Figure 2022073109000002
Figure 2022073109000002

１…フレキシブルダクト用内被体、３…帯状体、４…留部、４ａ…円周辺、５…縁部、６…縮径部、７…突出辺、８…先端辺、９…第１屈曲部、１０…第２屈曲部。 1 ... Inner cover for flexible duct, 3 ... Strip-shaped body, 4 ... Retaining part, 4a ... Circumference, 5 ... Edge part, 6 ... Reduced diameter part, 7 ... Protruding side, 8 ... Tip side, 9 ... First bending Part 10 ... Second bent part.

Claims (4)

螺旋状に重ね合わせた帯状体の縁部をかしめて留めた留部を有し、円筒状としたフレキシブルダクト用内被体であって、
前記内被体は、前記留部を内被体長手方向に向けて突出するように形成した縮径部を形成したことを特徴とするフレキシブルダクト用内被体。 It is a cylindrical inner cover for flexible ducts that has a retaining part that is fastened by crimping the edges of spirally overlapped strips.
The inner cover is an inner cover for a flexible duct, characterized in that a reduced diameter portion is formed so that the retaining portion projects in the longitudinal direction of the inner cover. 内被体長手方向に向けて突出するように形成した縮径部は、突出方向となる２つの突出辺と、該２つの突出辺を繋いで前記縮径部の螺旋方向に向けて所定の長さを有する先端辺とからなる凸状形状であることを特徴とする請求項１に記載のフレキシブルダクト用内被体。 The reduced diameter portion formed so as to project in the longitudinal direction of the inner body is formed by connecting two protruding sides in the protruding direction and the two protruding sides to a predetermined length in the spiral direction of the reduced diameter portion. The inner cover for a flexible duct according to claim 1, wherein the inner body has a convex shape including a tip side having a diameter. ２つの突出辺は、一方に螺旋状の円周辺を屈曲する２つの第１屈曲部と、他方に前記突出辺から先端辺を形成するための２つの第２屈曲部とを有し、
前記２つの突出辺は、第２屈曲部間の間隔が第１屈曲部間の長さよりも短くなるように各々が中央寄りに傾斜する傾斜辺からなることを特徴とする請求項２に記載のフレキシブルダクト用内被体。 The two protruding sides have two first bending portions that bend around a spiral circle on one side, and two second bending portions on the other side for forming a tip side from the protruding side.
The second aspect of claim 2, wherein the two protruding sides are each inclined side inclined toward the center so that the distance between the second bent portions is shorter than the length between the first bent portions. Inner cover for flexible duct. 円筒状にしたフレキシブルダクト用内被体を縮径する方法であって、
螺旋状に重ね合わせた帯状体の縁部に線材と鋼材とを配し、前記線材と前記鋼材とをかしめて留部として円筒状のフレキシブルダクト用内被体を成形する内被体製造工程と、
前記内被体製造工程で製造された内被体の外側から、留部の円周辺を支持しつつ先端に所定幅の押圧面を有する押圧具を押し付けることにより、凸状形状の縮径部を形成する縮径部形成工程と、を有することを特徴とするフレキシブルダクト用内被体の製造方法。 It is a method of reducing the diameter of the inner body for a flexible duct that has been made into a cylinder.
An inner body manufacturing process in which a wire and a steel are arranged on the edge of a spirally overlapped strip, and the wire and the steel are crimped to form a cylindrical inner body for a flexible duct as a retaining portion. ,
From the outside of the inner body manufactured in the inner body manufacturing process, a pressing tool having a pressing surface having a predetermined width is pressed against the tip while supporting the periphery of the circle of the retaining portion to form a convex-shaped reduced diameter portion. A method for manufacturing an inner body for a flexible duct, which comprises a step of forming a reduced diameter portion to be formed.
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