JP6198968B2 - duct - Google Patents

Description

  The present invention relates to a duct for connecting and forming a band-shaped sheet material by caulking (which may also be described as “caulking”) with a metal core disposed in a spiral shape.

  Conventionally, various ducts are known. For example, in Patent Documents 1 and 2, a strip-shaped continuous steel sheet core material is bent into a shape suitable for caulking and then arranged in a spiral shape, and the belt-shaped sheet material is caulked and fixed to the core material. -A duct formed by connecting is disclosed. In the duct described in Patent Document 1, as shown in FIG. 12 (a), the core member 50 is bent at an acute angle in the same direction near the center thereof and a bent portion 54 in which both edge portions are bent at an acute angle. The holding portion 52 and the middle intermediate portion 55 are formed into a hook shape, and the edge portion of the belt-like sheet material 51 is inserted into the hook-shaped space portion, and then the holding portion 52 is parallel to the intermediate portion 55. The sheet material 51 is caulked and connected by being bent (caulking and deforming) (FIG. 12B). Engaging protrusions are formed at the distal end of the bent portion 54 continuously or intermittently in the longitudinal direction. When the bent portion 54 is caulked and deformed, the edge portion of the sheet material 51 is pushed inward to increase the strength of the caulking connection, and when the bent holding portion 52 is slightly restored due to its elasticity, the sheet material The edge portion 51 is pressed against the intermediate portion 55 of the core member 50 and meshed with the edge portion, thereby increasing the strength of the caulking connection.

  In the duct described in Patent Document 2, as shown in FIG. 13A, the core member 60 includes a holding portion 62 in which both edge portions are bent at an acute angle, and a pressing piece 64 in which the tip is bent at a substantially right angle. And a central intermediate portion 65 is formed into a hook shape. Inside the hook-shaped portion, a strip-shaped sheet material 61 and a linear body 67 disposed thereon are disposed, and the sheet material 61 includes a linear body 67. By enclosing and pressing the edge portion 61a of the sheet material 61 so as to be arranged outside the hook-shaped portion, and then bending the holding portion 62 of the core material 60 so as to approach the intermediate portion 65. The sheet material 61 is caulked and connected (FIG. 13B). A predetermined gap is provided between the opposing pressing pieces 64 pressed against the intermediate portion 65 by caulking deformation, and both edge portions 61a of the sheet material 61 are disposed in the gap. The overlapping portion D is elastically sandwiched between the pressing piece 64 and the intermediate portion 65, and the linear member 67 included in the sheet material 61 that is crimped and formed into a bag shape serves as an anchor, and the strength of caulking connection Is increasing.

Japanese Patent No. 3323243 Japanese Patent No. 3284085 JP 2011-122615 A

  In recent years, ducts have excellent heat resistance that can be used in various environments, in particular, a wide range of heat resistance and heat insulation, excellent durability, incombustibility, chemical resistance, dimensional stability, flexibility, etc. In particular, a heat-resistant duct is required, and there is room for further improvement.

  For example, in Patent Document 3, in order to improve heat resistance, a heat-resistant duct that is formed by stacking two inner layer sheets and an outer layer sheet to form a sheet material, and an intermediate layer sheet is added between both sheets to form a sheet material with three layers. Heat resistant ducts have been proposed. However, when the thickness and / or layer of the sheet material to be crimped by the core material is increased, a greater restoring force is exerted, the clamping force of the crimping portion is reduced, and the crimped portion is easily detached when a tensile force is applied. There is a problem. Further, when the thickness of the sheet material is increased, there is a problem that the flexibility of the duct is lowered.

  Therefore, in the present invention, even if the thickness and / or layer of the sheet material (which can be understood as the total thickness in the case of multiple layers) is increased, the portion where the sheet material is connected (in other words, caulked connection) with the metal core is easy. It is an object of the present invention to provide a duct that does not come off.

According to one aspect of the present invention, a duct formed by winding a strip-shaped sheet material around a spiral interval of the core material around the core material having a spiral shape,
The core material is formed of a band-shaped metal plate, and the core material is formed by bending the two edge portions in the longitudinal direction so as to face each other, and the two holding members. An intermediate part between the parts,
Each of the two holding portions includes a first portion including a tip of the holding portion, and a second portion extending from the first portion, and the first portion and the second portion are a duct. Forming an obtuse angle in the cross section including the central axis of
In the inner space of the core material formed by the two holding portions and the intermediate portion of the core material, the opposing edge portions in the longitudinal direction of the sheet material each surround the linear body, and the edge And a duct in which the filament is compressed between the holding part and the intermediate part.

  In the duct according to the present invention, the linear body surrounded by the sheet material and compressed together with the sheet material works so as to prevent the movement of the sheet material. Furthermore, since the holding part of the core material is constituted by the first part and the second part forming an obtuse angle, even if the angle formed by each holding part and the intermediate part is slightly restored due to elasticity, the first part is the intermediate part. Get closer to. As a result, the sheet material can be more firmly sandwiched between the first portion and the intermediate portion. Therefore, according to the duct of the present invention, even if the thickness and / or layer of the sheet material is increased, the portion where the sheet material is connected (crimped connection) with the metal core material is not easily detached.

  In one aspect of the duct according to the present invention, the sheet material may be compressed between the tips of the first portions of the two holding portions arranged to face each other.

  With this configuration, the sheet material is sandwiched not only between the holding portion and the intermediate portion but also between the tips of the first portion, and the caulking connection becomes stronger.

  Opposing edge portions of the sheet material may be folded into an S shape and inserted into the internal space of the core material.

  In one aspect of the duct according to the present invention, the strip-shaped sheet material includes a resin-coated glass cloth strip that forms an outermost layer, a glass fiber strip that forms an intermediate layer, and a metal mesh strip that forms an innermost layer. The inner edge of the core material, and at least the opposite edge portions of the resin-coated glass cloth band in the longitudinal direction of the sheet material surround the filaments, respectively. And this filament may be compressed between the said holding | maintenance part and the said intermediate part.

  Thus, the heat resistance of a duct can be improved by making a sheet | seat material into the above multilayered structures. The sheet material that has become multilayered and has increased thickness is strengthened by the strong clamping force between the first portion and the intermediate portion of the core material as described above and the anchoring action of the striate compressed together with the sheet material. Since it is crimped, a duct that is difficult to break can be obtained.

  According to the duct according to the present invention, even if the thickness and / or layer of the sheet material is increased, the portion where the sheet material is connected (crimped connection) with the metal core material is not easily detached.

It is a side view showing typically one embodiment of a duct of this indication (a partial section is shown). It is sectional drawing which shows the multilayered structure of the sheet | seat material which can be used with the duct of this indication. It is sectional drawing which shows typically one Embodiment of the crimped connection part of the duct of this indication. FIG. 4 schematically shows the process of processing the core material of FIG. 3 and the method of use (fixing method). FIG. 4A schematically shows a metal plate for manufacturing the core material. FIG. 4B schematically shows a state before use (before fixing), and FIG. 4C schematically shows a state after use (after fixing). 3 schematically illustrates another embodiment of a core that can be used in the duct of the present disclosure. 6 schematically illustrates yet another embodiment of a core that can be used in the duct of the present disclosure. Another embodiment of the core which can be used with the duct of this indication is shown typically (before use (before fixation)). Another embodiment of the core which can be used with the duct of this indication is shown typically (before use (before fixation)). It is sectional drawing which shows typically the state which crimped and connected the sheet | seat material with the core material of another embodiment which can be used with the duct of this indication. FIG. 10A is a front view schematically showing the shape of the core material before the caulking deformation, and FIG. ) Is a diagram schematically illustrating a state after the sheet material is caulked and connected. It is a figure which shows typically the process of crimping and connecting a sheet | seat material with the core material of FIG. FIG. 12 (a) is a front view schematically showing the shape of the core material before caulking deformation, and schematically shows a conventional method of using the core material (fixing method). FIG. These are figures which show typically the state after carrying out caulking connection of the sheet | seat material. FIG. 13 (a) is a front view schematically showing the shape of the core material before caulking deformation, schematically showing another conventional method of using the core material (fixing method). b) is a diagram schematically showing a state after the sheet material is caulked and connected.

As a result of diligent research, the present inventor has determined that the sheet material forming the duct is the outermost layer formed from the resin-coated glass cloth band, the intermediate layer formed from the glass fiber band, and the outermost layer formed from the metal mesh band. The present inventors have found a duct having excellent performance such as durability, incombustibility, chemical resistance, dimensional stability, flexibility, etc., as well as excellent heat resistance, by forming a multilayer structure in which an inner layer is stacked. The duct of the present invention is a duct formed by winding a strip-shaped sheet material 1 around a core material 2 having a spiral shape along the spiral interval of the core material 2 as shown in one embodiment of FIG. 10. The strip-shaped sheet material 1 has a multilayer structure in which a resin-coated glass cloth band 3 that forms the outermost layer, a glass fiber band 4 that forms the intermediate layer, and a metal mesh band 5 that forms the innermost layer are stacked. (See, for example, FIG. 2), but the present invention is not limited to such a structure.
In the present disclosure, the core material 2 can be formed of a band-shaped metal plate, and the core material 2 is generally configured so that both edges in the longitudinal direction face each other, preferably in the longitudinal direction. And two holding portions 6 formed by bending (or folding back) in parallel with each other and an intermediate portion 7 between the two holding portions 6 (see, for example, FIGS. 3 and 4) )
Furthermore, in the present disclosure, at least the edge in the longitudinal direction of the resin-coated glass cloth strip 3 of the sheet material 1 is provided in the internal space S of the core material formed by the two holding portions 6 and the intermediate portion 7 of the core material 2. The resin-coated glass cloth band 3 may be fixed inside the core material 2 (see, for example, FIG. 3).

  In the present disclosure, as shown in FIG. 3, at least a part of the metal mesh band 5 is in contact with the outer surface of the holding part 6 of the core member 2, and the edge in the longitudinal direction of the metal mesh band 5 is the core. The metal mesh strip 5 may be disposed inside the material 2, and the metal mesh band 5 may be fixed inside the core material 2.

  The duct of the present disclosure has such a structure, in particular, a sheet material having a multi-layer structure, and thus has excellent heat resistance, excellent durability, nonflammability, chemical resistance, dimensional stability, flexibility, and other performance. Can be provided. In particular, since the duct of the present invention has a heat resistance temperature that is about four times or more that of the conventional one, for example, a heat resistance temperature in the range of -20 ° C to 500 ° C, it can be used as a heat resistant duct.

  Hereinafter, the duct of the present disclosure will be described in detail with reference to the illustrated embodiment.

Sheet Material For example, as shown in FIG. 1, in the duct 10 of the present disclosure, the sheet material 1 has a belt-like shape, and forms a duct (tube) by winding thereof, and a longitudinal edge portion thereof is These can be fixed (crimped together) by the core material 2 arranged in a spiral shape, which will be described in detail below.

  As shown in FIG. 2, the sheet material 1 may have a multilayer structure including a resin-coated glass cloth band 3, a glass fiber band 4, and a metal mesh band 5.

Resin-coated glass cloth band The resin-coated glass cloth band 3 can form the outermost layer of the duct, and can be formed from a material in which a glass cloth is coated (or impregnated) (hereinafter referred to as “band 3”). (May be abbreviated).

  There is no restriction | limiting in particular in resin which can be used for coating of glass cloth, For example, a silicone resin, a urethane resin, a polyester resin etc. are mentioned.

  Among these, it is preferable to use a silicone resin. The silicone resin is not particularly limited as long as it has a siloxane bond (Si—O bond). A siloxane bond has a large bond energy, and a silicone resin containing such a bond is excellent in performance such as heat resistance, chemical stability, and weather resistance.

There is no restriction | limiting in particular as a glass cloth which can be used in this indication, A woven fabric, a nonwoven fabric, etc. containing glass fiber can be used. The fineness of the glass fiber contained in the glass cloth is, for example, 1000 to 2000 dtex, preferably 1300 to 1400 dtex, particularly preferably 1350 dtex, and the basis weight is, for example, 200 to 400 g / m ² , preferably 300 to 350 g / m ² . The fiber length is not particularly limited. Such a glass cloth can provide excellent heat resistance, durability, incombustibility, and the like to the outermost layer of the duct.

  Resin-coated glass cloth band 3, especially silicone-coated glass cloth formed by coating a glass cloth with silicone resin, has excellent heat resistance, durability, mechanical properties, dimensional stability, chemical resistance, weather resistance, non-flammability Etc. have the performance.

  The resin-coated glass cloth band 3 has a maximum use temperature of 250 ° C. or more as heat resistance (can be measured in accordance with JIS C 8411: 1999 (synthetic resin flexible conduit)).

  The resin-coated glass cloth band 3 has, for example, excellent wear resistance as durability (JIS L 1096: 2010 “Fabric and Knitted Fabric Test Method” 8.19 Wear Strength and Friction Discoloration Method C (Taber) Can be evaluated by the shape method).

  The resin-coated glass cloth band 3 has, for example, excellent tensile strength (for example, 2000 to 2200 N / 30 mm, preferably 2100 N / 30 mm) and tearing force (for example, 75 to 125 N, preferably 100 N (“JIS K”) as mechanical properties. 7128-1 "), Young's modulus (for example, 80 to 120 MPa, preferably 100 MPa), elongation at break (for example, 4.0 to 6.0%, preferably 5.0%), dry It has a heat shrinkage (for example, 0 to 1%, preferably 0% (200 ° C. × 24 h)).

  The resin-coated glass cloth band 3 has, for example, a low creep property as a dimensional stability, and exhibits excellent stability against a long-term load (1000 hours or more).

  The resin-coated glass cloth band 3 has resistance to, for example, acid, alkali, salt, organic solvent, and fuel oil as chemical resistance.

  The thickness of the resin-coated glass cloth band 3 is, for example, 0.7 mm or less, 0.3 to 0.6 mm, preferably 0.3 to 0.4 mm. When the thickness is within such a range, the duct can be reduced in weight, and excellent ductility (reducing the bending radius) can be imparted to the duct. In addition, when the thickness of the resin-coated glass cloth strip 3 is within the above range, the core material 2 spirally disposed inside the tube described in detail below, and excellent flexibility in the duct Can be given.

  The length in the width direction of the resin-coated glass cloth strip 3 (the length in the direction perpendicular to the longitudinal direction of the strip (or the length between two edge portions in the longitudinal direction of the strip)) is, for example, 27 to 120 mm, preferably 32-90 mm.

  The length in the width direction of the resin-coated glass cloth band 3 is, for example, 1.05 with respect to the helical pitch (which is substantially equal to the helical interval) P (for example, see FIG. 1) of the core material 2. The size is -2.0 times, preferably 1.1-1.7 times. By setting it as such a dimension, as shown, for example in FIG. 3, in the internal space (for example, internal space S shown in FIG. 4) of the core material 2, the edge part of the longitudinal direction of the resin-coated glass cloth strip 3 is at least It will be able to turn back once.

Weight of the resin-coated glass cloth belt 3, for example 400-600 g / ^{m 2,} preferably 500~550g / ^{m 2.}

  The specific gravity (specific gravity with respect to water) of the resin-coated glass cloth band 3 is, for example, 1.2 to 1.8, preferably 1.4 to 1.6.

Glass fiber band Glass fiber band 4 can be disposed between resin-coated glass cloth band 3 that can form the outermost layer and metal mesh band 5 that can form the innermost layer. There is no particular limitation as long as it can provide performance such as heat insulation and incombustibility (hereinafter, it may be abbreviated as “band 4”). As shown in FIG. 3, the glass fiber band 4 only needs to be disposed at least between the core material disposed in a spiral shape, and the internal space of the core material described in detail below (for example, In the internal space S) shown in FIG. 4, the glass fiber band 4 may or may not exist.

  There is no restriction | limiting in particular in the glass fiber which comprises a glass fiber belt. The fineness of the glass fiber is, for example, 1100 to 2100 dtex, preferably 1400 to 1600 dtex. There is no particular limitation on the fiber length.

  The thickness of the glass fiber band 4 is, for example, 1.0 to 3.0 mm, preferably 1.0 to 2.0 mm. When the thickness is within such a range, the duct can be provided with heat resistance, heat insulation, and incombustibility. Further, when the thickness of the glass fiber band 4 is within the above range, the duct 2 and the core material 2 spirally disposed inside the tube described in detail below are provided with excellent flexibility in the duct. Can do.

  The length in the width direction of the glass fiber band 4 (the length in the direction perpendicular to the longitudinal direction of the band (or the length between two edge portions in the longitudinal direction of the band)) is, for example, 10 to 55 mm, preferably 12 to 52 mm.

  Further, the length in the width direction of the glass fiber band 4 is preferably substantially the same as the spiral pitch P of the core material 2 (see, for example, FIG. 1) or smaller than the spiral pitch P. . For example, it is preferably 5 to 10 mm smaller than the helical pitch P of the core material 2, and particularly preferably about 8 mm smaller.

The weight of the glass fiber band 4 is, for example, 1000 to 1300 g / m ² , preferably 1100 to 1200 g / m ² .

  The specific gravity (specific gravity with respect to water) of the glass fiber band 4 is, for example, 0.6 to 0.9, preferably 0.7 to 0.8.

Metal mesh band The metal mesh band 5 is capable of forming the innermost layer of the duct, and covers the glass fiber band 4 described above, so long as it can impart at least heat resistance and nonflammability to the duct. There is no particular limitation (hereinafter may be abbreviated as “band 5”).

  The metal mesh band 5 is preferably made of a material such as a metal or an alloy thereof (for example, iron, aluminum, titanium, steel, stainless steel, etc.), preferably a mesh made of stainless steel.

  There are no particular restrictions on the size, shape, and arrangement of the mesh holes in the metal mesh band 5.

  It is preferable to use a metal mesh band 5 formed of a stainless mesh, and performance such as heat resistance, nonflammability, and corrosion resistance can be further imparted to the duct.

  The thickness of the metal mesh band 5 is, for example, 0.05 to 0.20 mm, preferably 0.05 to 0.10 mm. When the thickness is within such a range, the duct can be reduced in weight, and excellent ductility (reducing the bending radius) can be imparted to the duct. Moreover, when the thickness of the metal mesh band 5 is within the above range, the duct 2 and the core material 2 spirally disposed inside the tube, which will be described in detail below, are given excellent flexibility to the duct. Can do.

  The length in the width direction of the metal mesh band 5 (the length in the direction perpendicular to the longitudinal direction of the band (or the length between two edge portions in the longitudinal direction of the band)) is, for example, 28 to 90 mm, preferably 30 to 71 mm.

  The length in the width direction of the metal mesh band 5 is, for example, 1.01 to 2.0 times, preferably 1.1, with respect to the helical pitch P of the core material 2 (for example, see FIG. 1). It is a dimension of ~ 1.6 times. By setting it as such a dimension, as shown, for example in FIG. 3, in the internal space (for example, internal space S shown in FIG. 4) of the core material, the edge part in the longitudinal direction of the metal mesh band 5 is folded at least once. Will be able to.

The weight of the metal mesh band 5 is, for example, 100 to 300 g / m ² , preferably 150 to 250 g / m ² .

  The specific gravity (specific gravity with respect to water) of the metal mesh band 5 is, for example, 7-8.

The core material 2 is, for example, as shown in FIG. 1 and can be spirally arranged inside the tube, and can firmly fix at least the resin-coated glass cloth strip 3 of the sheet material 1. is there. For example, as shown in FIG. 3, the core material 2 is particularly suitable as long as it can mechanically fix at least the resin-coated glass cloth band 3 of the sheet material along the edge in the longitudinal direction. There is no limit.

  As shown in FIG. 3, the core material 2 is preferably arranged by fixing the resin-coated glass cloth band 3 of the sheet material and the metal mesh band 5 in the internal space S of the core material 2. At this time, the glass fiber band 4 may or may not exist in the internal space S of the core material 2, and from the viewpoint of ensuring fixing (caulking connection) with the core material 2. It is preferable that the glass fiber band 4 does not exist in the internal space S of the core material 2.

  The core material 2 can impart excellent flexibility to the duct by having such a configuration. Moreover, since the core material 2 is helically arranged inside the pipe, the core materials 2 do not collide with each other when the duct is bent, the bending radius can be reduced, and excellent flexibility Can be given to the duct.

  The core material 2 can be formed from a strip-shaped metal plate, for example, as shown in FIG. There is no restriction | limiting in particular as a metal plate, For example, it can produce from materials (for example, iron, aluminum, titanium, steel, stainless steel, tinplate, etc.), such as a metal or its alloy, It produces from steel, especially stainless steel. It is preferable.

  There is no restriction | limiting in particular in the thickness of a metal plate, For example, it is 0.2-0.5 mm, Preferably it is 0.2-0.3 mm.

  The length in the width direction of the metal plate (the length in the direction perpendicular to the longitudinal direction of the metal plate (or the length between two edge portions in the longitudinal direction of the metal plate)) is, for example, 15 to 20 mm, preferably 16 to 18 mm.

  For example, as shown in FIG. 4B, the metal plate includes two holding portions 6 that can be formed by bending both side edges in the longitudinal direction in parallel with each other along the longitudinal direction, and the two holding portions. When the core material 2 is used, for example, as shown in FIG. 4C, in other words, the core material 2 is pressure-deformed to form a sheet material (not shown). ) Is fixed with the core material 2, the inner space S (the holding portion 6 and the intermediate portion) of the core material 2 formed by the two holding portions 6 and the intermediate portion 7 by further bending the two holding portions 6. 7 is fixed (caulking connection) in a state where at least the longitudinal edge of the resin-coated glass cloth band 3 of the sheet material is disposed in a space defined by 7 or a space that can be surrounded by a metal plate. (FIG. 3).

  There is no restriction | limiting in particular in the width direction length of the intermediate part of a metal plate, For example, it is 7.0-10.0 mm, Preferably it is 7.5-9.0 mm.

  When the length in the width direction of the intermediate portion of the metal plate is, for example, 1.8 to 8.5 times, preferably 2.5 to 7.5 times, the helical pitch P of the core material 2 (for example, see FIG. 1) It is good to make sure that By setting it as such a dimension, as shown, for example in FIG. 3, the edge part of the longitudinal direction of the resin coating glass cloth belt | band | zone 3 and the metal mesh belt | band | zone 5 as needed at least once in the internal space S of a core material. It can be folded and housed.

  Moreover, there is no restriction | limiting in particular in the angle which bends the holding | maintenance part 6 of a metal plate, For example, it is preferable to bend with respect to the intermediate part 7 with an acute angle larger than 0 degree | times and less than 90 degree | times.

  Further, the intermediate portion 6 may be bent or bent upward (that is, on the seat side shown in FIG. 3) in the central portion (see, for example, the intermediate portion 25 in FIG. 9).

  Furthermore, the holding | maintenance part 6 of a metal plate may have the press piece 8 so that the resin coating glass cloth strip | belt 3 can be further pressed, for example as shown in FIG. 5, FIG. The pressing piece 8 can be formed by further bending the above-described holding portion 6 in parallel along the longitudinal edge portion of the metal plate. The pressing piece 8 is formed with an acute angle (FIG. 5) of, for example, greater than 0 degrees and less than 90 degrees with respect to the holding portion 6, or an obtuse angle of greater than 90 degrees and less than 180 degrees (FIGS. 6 and 9). Alternatively, it may be formed at a right angle (90 degrees).

  For example, as shown in FIGS. 7 and 8, the pressing piece 8 may have a meshing protrusion 9 so that it can mesh with the resin-coated glass cloth band 3 (specifically, as shown in FIG. 7). (See the meshing protrusion 9a, the meshing protrusion 9b shown in FIG. 8). 7 and 8 correspond to FIG. 4B, and each shows a state before use (before fixing).

  The engagement protrusion 9a shown in FIG. 7 has a sawtooth shape that can be formed by, for example, pressing or cutting, and fixes the resin-coated glass cloth strip 3 in the form shown in FIGS. 5 and 6, for example. In this case, the belt 3 can be fixed more reliably. In addition, it is preferable that the meshing protrusion 9a is disposed on both of the two pressing pieces 8.

  The meshing protrusions 9b shown in FIG. 8 are burr-like protrusions that can be formed by, for example, pressing or punching. For example, when the resin-coated glass cloth band 3 is fixed in a form as shown in FIG. 3 can be fixed. In addition, it is preferable that the meshing protrusions 9b are disposed on both of the two pressing pieces 8.

  As such a pressing piece 8 and the meshing protrusion 9, those described in, for example, Japanese Patent No. 3323243 can be used.

  Further, in the internal space S of the core material 2, the longitudinal edge portion of the resin-coated glass cloth strip 3 (and the longitudinal edge portion of the metal mesh strip 5 as required) is, for example, FIG. As shown in 9), it may be fixed to the core material 2 (or the core material 20) in a state of being folded at least once. By folding in this way, the band 3 (and the band 5 as required) can be more reliably fixed by the core material 2.

  Further, as shown in FIG. 9, as the core material 20, two holding portions 21 formed by bending both side edges in the longitudinal direction to face each other, and an intermediate portion between the two holding portions 21. 25, each of the two holding portions 21 includes a first portion 22 (which may also be understood as a pressing piece) including the tip of the holding portion 21 and a second portion extending from the first portion 22 24, and the first part 22 and the second part 24 form an obtuse angle in a cross section (see FIG. 9) including the central axis of the duct. In the internal space of the core member 20 formed by the two holding portions 21 and the intermediate portion 25, the sheet material 1 (in the illustrated embodiment, the band 3, hereinafter, typically described as the band 3, will be described, but this embodiment (But not limited to this), the opposite edge portions in the longitudinal direction each surround the linear body 11, and the peripheral edge part and the linear body 11 are compressed between the holding portion 21 and the intermediate portion 25. . The core member 20 may be one in which the intermediate portion 25 is curved or bent (in the illustrated embodiment, it is curved or bent in a convex shape toward the internal space). The linear body 11 is disposed close to the folded portion of the band 3 or the bent portion of the intermediate portion 25 of the core member 20 and the holding portion 21 (for example, the obtuse angle portion formed by the first portion 22 and the second portion 24). Is preferred. Moreover, there is no restriction | limiting in particular in the dimension of the diameter of the linear body 11, What is necessary is just a dimension which can arrange | position the linear body 11 inside the core material 20. FIG. For example, in this embodiment, the diameter of the filament 11 may be 0.1 to 1.5 mm, and more preferably 0.2 to 1.2 mm.

  By disposing such a linear body 11 inside the folded portion of the band 3, the band 3 can be further firmly fixed (crimped) by the core member 20.

  There is no restriction | limiting in particular as the linear body 11, For example, a commercially available thread | yarn or a wire etc. can be used, Among these, synthetic resin fibers, such as an aramid fiber, a polyester fiber, a nylon fiber, a vinylon fiber, a carbon fiber, etc. It is preferable to use twisted yarns made from In particular, the heat resistance and moldability (such as dimensional stability) of the duct are improved by using a material that is excellent in heat resistance and hardly stretched, such as an aramid fiber. Further, when an aramid fiber is used, when the band 3 (and the band 5 as necessary) is fixed to the core member 20, the tension applied to the folded portion of the band 3 can be improved by 1.5 times or more. The folded portion of the band 3 can be disposed closer to the corner formed between the intermediate portion 25 and the holding portion 21 of the material 20, and in this state, the band 3 can be more securely attached. It can be fixed to the core material 20.

  Moreover, since an aramid fiber has heat resistance, it is preferable to use it in the duct of this embodiment.

  Hereinafter, the process of caulking and connecting the sheet material 1 with the core material 20 of the embodiment of FIG. 9 will be described in detail with reference to FIGS. 10 and 11. 10 and 11, the layer of the sheet material 1 having a three-layer structure is omitted and shown as a one-layer sheet material 31 for easy understanding and easy understanding.

  The core member 20 is formed by performing a stepwise bending process on a strip-shaped metal plate as described in, for example, Japanese Patent No. 3284085, thereby forming the shape shown in FIG. The holding portion 21 is formed of a holding portion 21 that is bent so as to face each other, leaving a central intermediate portion 25. More specifically, the holding portion 21 includes a second portion 24 that is bent with respect to the intermediate portion 25, and It consists of a first portion 22 (which can also be understood as a pressing piece) bent at an obtuse angle with respect to the second portion 24, and is formed into a hook shape as a whole. The intermediate portion 25 is gently curved in a convex shape toward the holding portion 21 side. As will be described later, this curve is formed to facilitate manufacture, and the intermediate portion before caulking need not be curved.

  FIG. 11 schematically shows a process of caulking and connecting the sheet material 31 to the core material 20. First, the formed core material 20 is spirally wound, and a strip-shaped sheet material 31 is provided between the adjacent core materials 20, and the filament 11 is disposed on the upper portion (FIG. 11A). One hook-shaped space of one core member 20, that is, a space formed by the first portion 22, the second portion 24, and the intermediate portion 25 of the holding portion surrounds the entire sheet member 11 with the sheet material 31. Then, it is folded into an S shape and pushed in (FIG. 11 (b)). Thereafter, the first portion 22 and the second portion 24 of the holding portion are pressed so as to press the mountain 23 formed by them from above the sheet material 31, and the second portion 24 is substantially parallel to the intermediate portion 25. The second portion 24 is bent so as to be (FIG. 11C). At this time, the edge 31a of the edge of the sheet material 31 is prevented from coming out of the space formed by the first portion 22, the second portion 24, and the intermediate portion 25. Furthermore, it is preferable that the edge portion end 31 a of the sheet material 31 is not compressed by the tip end portion 22 a of the first portion 22. Similarly, the sheet material 31 and the linear body 11 are arranged also in the other hook-shaped space of the core material 20, and the sheet material 31 is S-shaped so that the sheet material 31 surrounds the entire linear body 11. The first portion 22 and the second portion 24 of the holding portion are pressed, and the sheet material 31 and the linear body 11 are compressed. Finally, the core material 20 is pressed by pressing the intermediate portion 25 in the direction in which the curvature is corrected, while pressing the mountain 23 formed by the first portion 22 and the second portion 24 of the holding portion, While compressing the sheet material 31 and the linear body 11 in space moderately, the sheet material 31 between the 1st part 22 and the 1st part 22 which opposes is compressed moderately (FIG.11 (d)). In this way, the sheet material 31 is caulked and connected by the core material 20.

  In the present embodiment, since the first portion 22 and the second portion 24 that form the holding portion 21 of the core member 20 before crimping form an obtuse angle, the shape of the hook spreads outward, and further, the intermediate portion 25 is held. Since it is curved toward the portion 21, there is an advantage that it is easy to push the sheet material 31 and the filament 11 into the hook-shaped space. In addition, since the sheet material 31 is inserted so as to be folded into an S shape in accordance with the hook shape of the core material 20, there is no waste in manufacturing and it is efficient. Furthermore, since the edge portion end 31a of the sheet material 31 is located in the space formed by the first portion 22, the second portion 24, and the intermediate portion 25 of the holding portion 21, the sheet material is closed by the first portion 22. Compared with the case where the linear member 11 is encased by crimping into a bag shape (see, for example, Patent Document 2), it is possible to provide a sufficient clamping force while shortening the band width of the sheet material 31, Economical.

  In the present embodiment, as shown in FIG. 10B, the edge portion of the sheet material 31 is sandwiched between the intermediate portion 25 and the holding portion 21, and further, the first portion 22 and the first portion 22 that face each other. It is sandwiched between one portion 22. Thus, since it clamps in two places, crimping connection becomes firmer than the case where it clamps in one place like the past. As a result, the duct is durable even when the edge end 31a of the sheet material 31 is not compressed by the tip 22a of the first portion 22.

  Since the angle formed by the first portion 22 and the second portion 24 of the holding portion 21 in the core material 20 is an obtuse angle, after the first portion 22 and the second portion 24 are pressed to sandwich the sheet material 31, When the elasticity is slightly restored, the second portion 24 moves away from the intermediate portion 25, but the first portion 22 approaches the intermediate portion 25, and the sheet material 31 can be firmly held between the first portion 22 and the intermediate portion 25. it can. The angle formed by the first portion 22 and the second portion 24 of the holding portion 21 may be an obtuse angle, i.e., greater than 90 degrees and less than 180 degrees, and the material and thickness of the sheet material 31, the material of the filament 11, Depending on the diameter, the material and thickness of the core member 20 and the like, it is adjusted so as to have an appropriate caulking connection as described later. Usually, this angle is often not less than 100 degrees and not more than 170 degrees. When a tensile force is applied to the duct and the sheet material 31 is pulled in a direction to escape from the gap between the intermediate portion 25 and the first portion 22, the filament 11 that is compressed together with the sheet material 31 exists in the sheet material 31. For this reason (FIG. 10 (b)), the linear member 11 becomes an anchor, and the sheet material 31 becomes difficult to move (it becomes difficult to be pulled). Even if the sheet material 31 and the linear member 11 are pulled and moved to the first portion 22 side, the thickness of the sheet material 31 portion where the linear member 11 tries to come out between the intermediate portion 25 and the first portion 22 is increased. It becomes difficult to come off. Even if the sheet material 31 is pulled out between the intermediate portion 25 and the first portion 22, the sheet material 31 is sandwiched between the first portion 22 and the first portion 22 facing each other, so that the duct is immediately broken. There is nothing to do.

  The degree to which the sheet material 31 is compressed in the last step of caulking connection (see FIG. 11D) is appropriate depending on the material and thickness of the sheet material 31, the material and diameter of the striate body 11, and the material and thickness of the core material 20. And the portion where the sheet material 31 is caulked in accordance with the use environment (for example, the maximum tensile force expected to be applied to the installation place or the duct), for example, the tip portion of the first portion 22 Adjust so that it is not cut by. Usually, the distance between the crimped intermediate portion 25 and the first portion 22 is 0.3 to 0.9 times the thickness of the sheet material 31, and the distance between the first portion 22 and the first portion 22 facing each other is 0.3 to 0.9 times. It may be adjusted to be about 0.5 to 1.7 times the thickness of the sheet material 31. Depending on the material and thickness of the sheet material 31, the material and diameter of the striate body 11, and the material and thickness of the core material 20, the curvature of the intermediate portion 25 of the core material 20 is straightened as shown in FIG. Sometimes it is done.

Duct The duct of the present disclosure, for example, as shown in FIG. 3 and FIG. 9, arranges at least the edge portion in the longitudinal direction of the band 3 of the above-described multilayered sheet material on the core materials 2 and 20, and in this state, By fixing the band 3 to the core materials 2 and 20 by pressing the holding portions 6 and 21 (or the pressing pieces 8 and the first portion 22 thereof) of the core materials 2 and 20 toward the intermediate portions 7 and 25. Can be produced. At this time, as shown in FIG. 1, the core material 2 is arranged in a spiral shape, and while winding the sheet material 1, at least the band 3 is arranged in the internal space of the core material 2 and is continuously fixed. Is the same.

  As a method for manufacturing such a duct, for example, the methods described in Japanese Patent No. 323243 and Japanese Patent No. 3284085 can be applied. The contents described in Japanese Patent No. 323243 and Japanese Patent No. 3284085 are all incorporated herein by reference.

  The outer diameter Do of the duct 10 of the present disclosure is, for example, 55 to 1000 mm, preferably 59 to 914 mm.

  The inner diameter Di of the duct 10 of the present disclosure is, for example, 47 to 992 mm, preferably 51 to 906 mm.

  The duct 10 has a thickness (the thickness of the sheet material 1) of, for example, 1.0 to 3.8 mm, preferably 1.35 to 2.5 mm. The duct 10 can exhibit excellent flexibility in spite of having such a thickness.

  The helical pitch P of the duct 10 (the helical pitch of the core material 2) is, for example, 18 to 100 mm, preferably 20 to 60 mm. By setting the helical pitch P within the above range, the bending radius of the duct can be reduced, and the flexibility and flexibility of the duct can be improved.

Duct Performance The duct of the present disclosure has performances such as excellent heat resistance, excellent durability, non-flammability, chemical resistance, dimensional stability, flexibility, and the like.

Heat Resistance The duct of the present disclosure has a maximum use temperature of 1000 ° C. or more as heat resistance (measured in accordance with JIS C 8411: 1999 (synthetic resin flexible conduit)).
Also, the duct of the present disclosure has a wide application temperature range of, for example, -20 to 500 ° C, preferably -20 to 450 ° C.
Alternatively, it has a thermal conductivity (20 ° C.) of, for example, 0.040 to 0.100 W / m · K, preferably 0.080 to 0.090 W / m · K (ASTM E 1530-04 “Standard” Test Method for Evaluating the Resistance to Thermal Transmission of Materials by the Guarded Heat Flow Meter Technique ”).

Durability The duct of the present disclosure has excellent wear resistance as durability (JIS L 1096: 2010 “Fabric and Knitted Fabric Test Method” 8.19 Wear Strength and Friction Discoloration Method C (Taber Form Method) As a result of evaluation in (4), it was found that the wear loss (about 1000 times) was about 0.45 g)

Non-flammability Duct of the present disclosure is UL-94: 1996 “UL Standard for Safety for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances” 5V method: 500 W (125 mm) vertical combustion test, “UL-94 5VA” It has excellent nonflammability that conforms to

Chemical Resistance The duct of the present disclosure is particularly resistant to acids, salts, organic solvents, and fuel oils (eg, mineral oil, gasoline, kerosene, heavy oil) as chemical resistance.

Dimensional stability The duct of the present disclosure has low creepability as dimensional stability, and can exhibit excellent stability against a long-term load (1000 hours or more).

Flexibility The duct of the present disclosure has the conventional structure, particularly the multilayer sheet structure and the core material arranged in a spiral shape inside the pipe, despite the fact that the thickness of the duct is within the above range. Compared with a duct having the same thickness, excellent flexibility can be exhibited, and heat resistance equal to or higher than that of a conventional duct can be exhibited.

  As described above, the duct of the present disclosure has been described above through various embodiments. However, these have been described by way of example for the purpose of better understanding of the present invention, and can be appropriately modified or modified within the scope of the present invention. Modifications and additions are allowed. For example, the core material and the caulking connection structure described above may be suitably used even when the sheet material does not have a three-layer structure and the sheet material has one layer. The length and bending angle of the first portion and the second portion constituting the intermediate portion, the holding portion, the pressing piece, and / or the holding portion of the core material are the material, thickness, and filament of the sheet material used in each embodiment. It can be appropriately adjusted depending on the material and diameter of the body. Moreover, the core part of embodiment of FIG. 9 does not need to curve the intermediate part before crimping, and may curve when compressing a sheet | seat material and a linear body suitably after crimping.

  As described above, the duct of the present invention has a stronger caulking connection than before, and further has excellent heat resistance (250 ° C. or higher, for example, a maximum operating temperature of 1000 ° C. and a wide range of applications of −20 to 500 ° C. Excellent durability, non-flammability, chemical resistance, dimensional stability, flexibility, etc., in addition to temperature range, thermal conductivity (20 ° C) of 0.080-0.090 W / m · K Therefore, it can be used as a heat-resistant duct (for example, an exhaust duct, a boiler duct, etc.) in various fields.

  This application claims the priority based on Japanese Patent Application No. 2015-133647 for which it applied on July 2, 2015, and all the description content is used by reference in this specification.

DESCRIPTION OF SYMBOLS 1, 31 Sheet material 2, 20 Core material 3 Resin coating glass cloth band 4 Glass fiber band 5 Metal mesh band 6, 21 Holding part 7, 25 Intermediate part 8 Pressing piece 9 Engagement protrusion 10 Duct 11 Linear body 22 1st part 24 2nd part S Internal space of core material

Claims (4)

It is a duct formed by winding a strip-shaped sheet material around the core material having a spiral shape along the spiral interval of the core material,
The core material is formed of a band-shaped metal plate, and the core material is formed by bending the two edge portions in the longitudinal direction so as to face each other, and the two holding members. An intermediate part between the parts,
Each of the two holding portions includes a first portion including a tip of the holding portion, and a second portion extending from the first portion, and the first portion and the second portion are a duct. Forming an obtuse angle in the cross section including the central axis of
In the inner space of the core material formed by the two holding portions and the intermediate portion of the core material, the opposing edge portions in the longitudinal direction of the sheet material each surround the linear body, and the edge A duct in which the section and the filament are compressed between the holding section and the intermediate section.   The duct according to claim 1, wherein the sheet material is compressed between the tips of the first portions of the two holding portions disposed to face each other.   The duct according to claim 1 or 2, wherein the opposing edge portions of the sheet material are folded into an S shape and inserted into the internal space of the core material.   The band-shaped sheet material has a multilayer structure including a resin-coated glass cloth band that forms an outermost layer, a glass fiber band that forms an intermediate layer, and a metal mesh band that forms an innermost layer. In the internal space, at least the opposite edge portions of the sheet material in the longitudinal direction of the resin-coated glass cloth band surround the linear body, and the peripheral edge portion and the linear body are the holding portion and the The duct according to any one of claims 1 to 3, wherein the duct is compressed between intermediate portions.

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