JP4772300B2 - 2-layer duct - Google Patents

Description

  The present invention relates to a two-layer duct that is formed by dividing the inside into two flow paths and can be bent freely.

  Conventionally, this type of two-layer duct is known in which a wavy portion is provided on a partition wall that divides the space in the duct in order to easily bend and improve workability (see, for example, Patent Document 1). .

  Hereinafter, the configuration of the two-layer duct will be described with reference to FIGS. 14 and 15.

As shown in the figure, a two-layer duct 101 formed of a soft vinyl chloride resin or the like that can be bent freely, and a partition wall 102 that divides the ventilation path in the two-layer duct 101 is approximately in the ventilation direction. In addition to being provided in parallel, the partition wall 102 is formed with a corrugated portion 103a that travels in a direction perpendicular to the ventilation direction, or a corrugated portion 103c that travels in the ventilating direction, and a flat plate is formed at both ends 104 of the two-layer duct 101. A partition wall 103b is formed.
Japanese Patent Laid-Open No. 11-325566

  In the case of the corrugated portion 103a in such a conventional two-layer duct, when the duct 101 is bent in the bending direction A, the partition wall 102 has greater rigidity than the flat partition wall in the bending direction A, so that it is difficult to bend. Since the partition wall 102 cannot be bent smoothly and corresponds to the bending of the two-layer duct 101 so as to be bent at a portion where stress is strongly applied, the ventilation path cannot be formed smoothly, and the ventilation resistance in the two-layer duct 101 However, there was a problem that the performance of the ventilation fan was greatly affected.

  In addition, when the wavy portion 103a is formed on the partition wall, the surface area in the ventilation path is larger than that in the case of a flat partition wall, so the air resistance in the ventilation path is increased, and is related to straight pipes and curved pipes. However, there is a problem that the ventilation resistance in the two-layer duct 101 is increased and the performance of the ventilation fan is affected.

  Further, when the wavy portion 103c is formed on the partition wall, unevenness is formed in parallel with the ventilation direction, so that the ventilation resistance of the two-layer duct 101 becomes large regardless of whether it is a straight pipe or a curved pipe, and the performance of the ventilation fan There was a problem of influencing

  The present invention solves the above-described problems, and an object of the present invention is to provide a two-layer duct excellent in low ventilation resistance and bendability.

  In order to achieve the above object, the two-layer duct according to the present invention is a two-layer duct having a bendable flexibility including a partition wall that divides the inside of the duct into two flow paths substantially parallel to the ventilation direction. The partition wall is formed of a thermoplastic elastomer.

  In the two-layer duct of the present invention, the thermoplastic elastomer is an olefin elastomer.

  Moreover, the two-layer duct of the present invention is a two-layer duct having a partition wall that is provided with a partition wall that divides the inside of the duct into two flow paths substantially parallel to the ventilation direction, and is flexible. Is formed of a stretchable material having a tensile strength in the range of 10 to 60 MPa.

  Moreover, the two-layer duct of the present invention is a two-layer duct having a partition wall that is provided with a partition wall that divides the inside of the duct into two flow paths substantially parallel to the ventilation direction, and is flexible. Is formed of a stretchable material having a tensile strength in the range of 0.2 to 5 MPa.

  The two-layer duct of the present invention is characterized in that a rib is provided on the partition wall on the duct inner peripheral surface side.

  The two-layer duct of the present invention is characterized in that a flock is formed on the surface of the partition wall.

  In the two-layer duct of the present invention, an air layer is provided on the partition wall.

  In the two-layer duct of the present invention, the partition wall is provided with a protruding portion that protrudes toward the air layer in a direction perpendicular to the ventilation direction.

  Moreover, the two-layer duct of the present invention is a two-layer duct having a partition wall that is provided with a partition wall that divides the inside of the duct into two flow paths substantially parallel to the ventilation direction, and is flexible. Is formed of polyethylene foam.

  In the two-layer duct of the present invention, in the direction perpendicular to the ventilation direction in the duct, the thickness of the partition wall is greater on the inner surface side of the partition wall or on the center side of the duct than on the other side. It is formed.

  Further, the two-layer duct of the present invention is characterized in that the partition wall thickness is unevenly formed in the ventilation direction in the duct.

  The two-layer duct according to the present invention is characterized in that a plurality of groove portions extending in a direction perpendicular to the ventilation direction in the duct are provided in the partition wall.

  The two-layer duct of the present invention is characterized in that at least one groove portion extending in the ventilation direction in the duct is provided in the partition wall.

  According to the present invention, it is possible to provide a two-layer duct having both low ventilation resistance and ease of bending.

The two-layer duct according to the first aspect of the present invention includes a partition wall that divides the inside of the duct into two flow paths substantially parallel to the ventilation direction, and is formed by a cylindrical portion having bendable flexibility. It is a two-layer duct, and the partition wall is formed in a flat plate shape with a thermoplastic elastomer having elasticity, and the partition plate is bent in a direction orthogonal to the wall surface of the partition wall so as to prevent a decrease in air volume. The outer side of the pipe extends and the inner side shrinks, and when bent in a direction along the wall surface, the partition plate is deformed along the curve of the cylindrical portion, and a rib is provided on the partition wall on the inner peripheral surface side of the duct. It is a feature that can make the duct easy to bend by suppressing the repulsive force of the partition wall when the duct is bent, and also reduces the undulation of the partition wall when the duct is bent. By keeping the surface almost smooth, the duct Irregularities occurring air passage formed by the surface and the partition wall surface is small, it can provide a two-layer duct having a reduced flow resistance. In addition, the rib has the strength to withstand the stress concentrated on the duct inner peripheral surface side of the partition wall when the duct is bent, so that the deformation of the partition wall can be reduced, and the partition wall can be expanded and contracted, Reduces the waviness of the partition wall due to the stress caused by bending and reduces the unevenness generated in the ventilation path formed by the duct inner surface and the partition wall surface, thereby suppressing an increase in ventilation resistance when the duct is bent. be able to.

  The invention according to claim 2 is characterized in that, in the two-layer duct according to claim 1, the thermoplastic elastomer is an olefin-based elastomer, and is particularly stretchable among the thermoplastic elastomers. By forming the partition wall with an excellent olefin-based elastomer, the repulsion force of the partition wall when the duct is bent can be suppressed to make the duct easy to bend, and the partition wall is corrugated when the duct is bent. By reducing the air flow and keeping the surface of the partition wall in a smooth state, it is possible to provide a two-layer duct with reduced airflow resistance by reducing the irregularities generated in the ventilation path formed by the duct inner surface and the partition wall surface. .

The invention according to claim 3 is characterized in that in the two-layer duct according to claim 1 or 2 , an air layer is provided on the partition wall, and the temperature of the two flow paths is reduced. The heat conduction of the partition wall when different air is ventilated can be suppressed, and the occurrence of condensation inside the duct can be suppressed.

According to a fourth aspect of the present invention, in the two-layer duct according to the third aspect , the partition wall is provided with a protruding portion that protrudes toward the air layer in a direction perpendicular to the ventilation direction. When the duct is bent, the partition walls existing with the air layer in between are not in contact with each other, and at least the air layer corresponding to the projecting length of the projecting portion can be retained. It is possible to suppress heat conduction of the partition wall when air having different temperatures is passed through the road, and to suppress the occurrence of condensation inside the duct.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

(Embodiment 1)
As shown in FIG. 1, FIG. 2, and FIG. 3, the two-layer duct of the present invention has a partition wall 6 that divides the inside of the duct into two flow paths in the ventilation direction, and is flexible enough to be bent. And the partition wall 6 is formed with the thermoplastic elastomer which is a material provided with the elasticity.

  As the thermoplastic elastomer here, a vinyl chloride elastomer, a styrene elastomer, or an olefin elastomer can be used. In particular, it is desirable to form the partition wall 6 with an olefin-based elastomer excellent in stretchability among thermoplastic elastomers.

  The two-layer duct 4 has a cylindrical portion 7 made of a soft resin or an olefin elastomer, and a core 8 and a reinforcing core 9 for holding the two-layer duct 4 in a cylindrical shape on the outer periphery of the cylindrical portion 7 are made of a hard resin or a polypropylene resin. It is formed in a spiral shape and bonded to the cylindrical portion 7. The partition wall 6 and the cylinder part 7 are bonded together by attaching a molten adhesive resin to the joint part.

  In the two-layer duct 4, the core 8 and the reinforcing core 9 may be configured by an annular ring.

  The partition wall 6 can be formed by adhering the partition wall 6 to the inner wall surface of the extruded two-layer duct 4 or can be integrally formed by blow molding.

  The cylindrical portion 7 is preferably formed of the same material as that of the partition wall 6. However, if the partition wall 6 has elasticity, a material different from that of the cylindrical portion 7, for example, a vinyl chloride resin other than the above-described thermoplastic elastomer. It may consist of. However, in that case, it is necessary to select materials so that no shift occurs between the materials.

  Further, the material constituting the partition wall 6 preferably has a tensile strength in the range of 10 to 60 MPa and a tensile elongation of 300 to 1200% (according to JIS K 7113, JIS K 6251, or JIS K 6767). Measurement).

  In the above configuration, when the two-layer duct 4 is bent in the bending direction A when the two-layer duct 4 is connected to the ventilation fan 1 and appropriately bent in the building, the partition wall 6 becomes stretchable as shown in FIG. Therefore, the outer portion 6a of the partition wall in the bent state is stretched by tensile stress as it approaches the outside of the two-layer duct 4, and the inner portion 6b of the partition wall is The closer to the inner side, the more compressive stress is applied and the shrinkage occurs.

  Although the inner portion 6b of the partition wall may be wrinkled due to excessive bending of the two-layer duct 4 that exceeds the shrinkage limit, the inner portion 6b of the partition wall may appear as wrinkles. Even in such a state, the airflow distribution of the airflow in the ventilation path is large on the outer wall portion 6a side of the partition wall and conversely on the inner wall portion 6b side of the partition wall. Since the influence on the airflow resistance due to is small, if the two-layer duct 4 has the characteristics described in the present invention, it is possible to prevent a decrease in the air volume.

  Further, when the two-layer duct 4 is bent in the bending direction B, as shown in FIG. 5, the partition wall 6 is also deformed along the bending of the cylindrical portion 7 to form smooth ventilation paths 5a and 5b. it can.

  Further, the partition wall 6 can cope with the bending of the two-layer duct 4 with no great repulsive force in any of the bending directions A and B.

  In actual sites, the length of the ducts required varies, and if the length of the ducts required in the site is very short relative to the length of the two-layer duct 4 used, 2 Although it can respond also by bending and piping the surplus part of the layer duct 4, in this case, the ventilation resistance of the two-layer duct 4 increases, and the ventilating fan 1 cannot exhibit the desired performance. The two-layer duct 4 needs to be cuttable and can be easily connected to the ventilation fan 1 or other members.

  And in this Embodiment, since the partition wall 6 is formed in flat form in any position with respect to the ventilation direction of the two-layer duct 4, the two-layer duct 4 is cut | disconnected in an appropriate position. It is possible, and the connection with the ventilation fan 1 or a member can also be performed easily.

  In this embodiment, as shown in FIGS. 5 and 6, a rib 10 having a thickness larger than that of the other part of the partition wall 6 may be provided at a joint part between the partition wall 6 and the inner surface of the cylindrical part 7. . In this case, when the two-layer duct 4 is bent in the bending direction B, the rib 10 has a partition wall distortion 6c that is most severely bent due to the degree of expansion and contraction of the partition wall 6 and is generated near the center of the partition wall 6. Can be corrected by holding it more firmly.

  Moreover, since the rib 10 aims at correcting the distortion 6c of the partition wall 6, it is desirable to form the rib 10 with the same material as the partition wall 6 or to select a material harder than the partition wall 6.

  Further, the rib 10 may be formed by giving a thickness when the cylindrical portion 7 and the partition wall 6 are bonded or molded.

(Embodiment 2)
As shown in FIG. 7, the difference from the first embodiment is that a flock 11 is applied to the surface of the partition wall 6. Other configurations are the same as those of the first embodiment, and the description thereof is omitted.

  In the present embodiment, the material of the flock 11 is a nylon pile having a diameter of about 1.5 mm and a length of about 0.5 mm. The flock 11 is applied to the partition wall 6 and then the nylon pile is applied to the partition wall 6. Spray to fix and form.

  In the two-layer duct of the present invention, fluid flows through the ventilation path 5a and the ventilation path 5b in directions opposite to each other. For example, in the case shown in FIG. 1, outdoor air passes through the ventilation path 5a. The indoor side air is communicated with the outdoor side via the ventilation fan 1 and the ventilation path 5b.

  In such a state of use, when the outdoor air at high temperature and humidity in summer is ventilated through the air passage 5a and the cooled air at the indoor side is ventilated through the air passage 5b, the partition wall 6 is cooled on the indoor side. The surface temperature of the partition wall 6 on the ventilation path 5a side is lower than the air temperature on the outdoor side.

  If the surface temperature of the partition wall 6 on the side of the ventilation path 5a falls below the dew point temperature of the air on the outdoor side, condensation will occur on the surface of the partition wall 6 on the side of the ventilation path 5a, but the flocks 11 applied to the partition wall 6 Therefore, the temperature drop of the partition wall 6 can be suppressed, and the dew condensation resistance can be improved.

  Also in the winter season, outdoor low-temperature air is ventilated through the ventilation path 5a, and indoor high-temperature and humid air is ventilated through the ventilation path 5b, so that the surface of the partition wall 6 on the ventilation path 5b side is in summer. Although the same phenomenon as the case occurs, the same effect can be obtained by the flocks 11 applied to the surface of the partition wall 6.

  In the embodiment shown in FIG. 7, the flocks 11 are formed on both sides of the outer portion 6a of the partition wall, but only one side may be used as long as the required heat insulation performance can be obtained.

  In the present embodiment, a heat insulating layer is constituted by an air layer 12 formed by providing an air layer inside the partition wall or by providing two partition walls 6B in the cylindrical portion 7 as shown in FIG. In such a case, it has a heat insulating effect that suppresses heat transfer between fluids flowing on both side surfaces of the partition wall.

  In this case, when the two-layer duct 4 is bent in the bending direction B, the two partition walls 6B are displaced with respect to the bend of the two-layer duct 4, so that a portion where the air layer 12 is partially thinned is generated. Insulation performance may be deteriorated. However, as shown in FIG. 9, when the two-layer duct 4 is bent in the bending direction B by providing the protrusion 13 on the surface of the partition wall 6C on the air layer 12 side, the two partition walls 6C are respectively When the displacement reaches a certain bend, the projecting portion 13 and the partition wall 6C facing the projecting portion 13 come into contact with each other, and an air layer at least as thick as the projecting portion 13 can be secured. That is, the heat insulation performance required by the air layer 12 formed by the partition wall 6C can be ensured, and the condensation resistance can be improved.

  In addition, the shape of the protrusion 13 may be a protrusion shape or a rib shape, and the position may be provided only on one partition wall 6C, or may be non-uniformly arranged.

  Moreover, although the material of the protrusion part 13 is not limited to the partition wall 6C and the cylinder part 7 being the same, it is desirable to use the material which does not have transition property so that the protrusion part 13 and the partition wall 6C may not adsorb | suck.

  In addition, in this Embodiment, it is good also as a structure which forms the partition wall 6 itself with the heat insulating material which has the expansion | extension property of independent foaming or semi-independent foaming like a polyethylene foam or a rubber-type foam.

  Further, such a heat insulating material preferably has a tensile strength in the range of 0.2 to 5 MPa and a tensile elongation of 300 to 600% (according to JIS K 7113, JIS K 6251, or JIS K 6767). Measurement). By configuring the partition wall with such a material, desired stretchability can be secured even if the wall thickness of the partition wall is reduced, and the air path resistance can also be reduced due to the thin wall thickness.

  Further, it is desirable that the heat insulating performance has a thermal conductivity of 0.04 W / mK or less. By configuring the partition wall with such a material, it is possible to ensure the desired heat insulation performance even if the wall thickness of the partition wall is reduced, and it is also possible to reduce the air path resistance due to the thin wall thickness.

(Embodiment 3)
As shown in FIG. 10, the difference from the first embodiment is that the thickness of the partition wall 6D is changed between the inner surface side and the center side of the cylindrical portion 7 in the direction perpendicular to the ventilation direction. Specifically, in the direction perpendicular to the ventilation direction in the duct, one of the inner surface side of the partition wall 6D or the center side of the duct is formed thicker than the other side. It is.

  In the present embodiment, the thickness of the partition wall 6D located on the inner surface side of the cylinder part 7 is made thicker than the thickness of the partition wall 6D located on the center side of the cylinder part 7.

  When the two-layer duct 4 is bent in the bending direction B, stress concentrates on the partition wall 6D near the center of the cylindrical portion 7, and the partition wall 6D is pulled toward the outer diameter side of the two-layer duct 4. By forming the partition wall 6D thin, it easily expands when the two-layer duct 4 bends, reduces the amount of stress applied to the partition wall 6D, and ensures the ventilation path 5a and the ventilation path 5b more evenly and smoothly. Thus, the air path resistance can be reduced.

  Further, the wall thickness of the partition wall 6D may be reduced in the vicinity of the inner surface of the cylindrical portion 7. In this case, if the partition wall 6D is bent in the bending direction A, the partition wall 6D located outside the two-layer duct 4 in the bent state is Since the partition wall 6 </ b> D that extends easily and is located inside can be easily shrunk, the ventilation path 5 a and the ventilation path 5 b can be ensured uniformly and smoothly against the bending of the two-layer duct 4.

  In this embodiment, as shown in FIG. 11, when the partition wall 6 between the end portions 4a-4b of the two-layer duct 4 is changed in thickness in a direction substantially parallel to the ventilation direction, When the two-layer duct 4 is bent in the bending direction B, the stress applied to the partition wall 6E is distributed to the thin wall portion, so that the deformation of the partition wall 6E can be reduced, and the ventilation path 5a and the ventilation path 5b are more evenly and A smooth air passage can be secured.

  Moreover, you may combine combining changing the thickness of the partition wall 6 about the direction perpendicular | vertical with respect to a ventilation direction, and also changing the thickness of the partition wall 6 about a ventilation direction.

  As shown in FIG. 12, in this embodiment, when a plurality of grooves 14 are provided in the partition wall 6 in the direction perpendicular to the ventilation direction, the bent state is obtained when the two-layer duct 4 is bent in the bending direction A. The partition wall 6 located outside the two-layer duct 4 in FIG. 4 extends around the thin groove portion 14, and the inner partition wall 6 contracts around the thin groove portion 14, so that the displacement of the main partition wall 6 and The deformation can be absorbed by the groove portion 14, and the ventilation paths 5a and 5b can be ensured uniformly and smoothly.

  When the two-layer duct 4 is bent in the bending direction B, the groove portion 14 of the partition wall 6 mainly extends with respect to the bending of the duct, and the displacement and deformation of the main partition wall 6 can be absorbed by the groove portion 14. The path 5a and the ventilation path 5b can be ensured to be uniform and smooth.

  In addition, the shape and depth of the groove part 14 will not be specifically limited if a thin part can be formed in the partition wall 6, and the space | interval of the groove part 14 is not limited to the thing made into a uniform space | interval.

  Moreover, the groove part 14 may be formed in either one surface of the partition wall 6, or may be formed in both surfaces.

  In addition, in this Embodiment, as shown in FIG. 13, it is good also as a structure which provides the groove part 14 in the partition wall 6 about a ventilation direction.

  Moreover, you may combine combining the groove part 14 in the partition wall 6 about the direction perpendicular | vertical to a ventilation direction, and also providing the groove part 14 in the partition wall 6 about a ventilation direction.

  The two-layer duct of the present invention is used as a duct that can be connected to a ventilator, an air conditioner, a ventilation box, an air supply / exhaust grill, etc. and can be flexibly bent in a building to constitute a two flow path. Useful.

Construction drawing showing a state in which the two-layer duct according to Embodiment 1 of the present invention is constructed Perspective view showing the two-layer duct Sectional view showing the two-layer duct Sectional view showing the bent state of the two-layer duct Sectional view showing the bent state of the two-layer duct Sectional view showing the two-layer duct Sectional drawing which shows the two-layer duct of Embodiment 2 of this invention Sectional drawing which shows the air layer provided in the partition wall of the two-layer duct Sectional drawing which shows the state which bent what formed the projection part in the air layer provided in the partition wall of the same two-layer duct Sectional drawing which shows the two-layer duct of Embodiment 3 of this invention Sectional drawing which shows the thickness shape of the ventilation direction of the partition wall of the two-layer duct Sectional drawing which shows the groove | channel provided in the partition wall of the two-layer duct Sectional drawing which shows the groove | channel provided in the partition wall of the two-layer duct in the ventilation direction Configuration diagram showing a conventional two-layer duct Sectional view showing the two-layer duct

Explanation of symbols

4 Double-layer duct 4a Duct end 4b Duct end 5a Ventilation path 5b Ventilation path 6 Partition wall 6A Partition wall 6B Partition wall 6C Partition wall 6D Partition wall 6E Partition wall 7 Cylindrical part 10 Rib 11 Flocking 12 Air layer 13 Projection part 14 Groove

Claims (4)

A two-layer duct having a partition wall that has a partition wall that divides the inside of the duct into two flow paths substantially parallel to the ventilation direction, and that is formed of a bendable and flexible cylinder, the partition wall being stretchable The outer side of the partition plate extends and the inner side shrinks, and the direction along the wall surface is formed when the plate is bent in a direction perpendicular to the wall surface of the partition wall so as to prevent a decrease in air flow. The two-layer duct is characterized in that the partition plate is deformed in a shape along the bend of the cylindrical portion when the tube is bent, and a rib is provided on the partition wall on the inner peripheral surface side of the duct. The two-layer duct according to claim 1, wherein the thermoplastic elastomer is an olefin elastomer. The two-layer duct according to claim 1, wherein an air layer is provided on the partition wall . The two-layer duct according to claim 3 , wherein the partition wall is provided with a protruding portion that protrudes toward the air layer side in a direction perpendicular to the ventilation direction .

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