JP6175689B2 - duct - Google Patents

Description

  The present invention relates to a duct, and more particularly to a heat insulation technique for a duct.

  Ducts used for cooling, heating, ventilation, etc. often circulate a fluid having a temperature different from the ambient temperature of the outside air or the room. For this reason, the duct is required to have heat insulation properties from the viewpoint of preventing heat loss and preventing condensation. Conventionally, various techniques for insulating a duct have been proposed (see, for example, Patent Document 1).

  The duct of Patent Document 1 is obtained by coating a heat shrinkable foamed resin sheet on the outer peripheral surface of a duct body forming a fluid flow path. A closed space is formed between the outer peripheral surface of the duct main body and the heat-shrinkable foamed resin sheet, and the closed space provides heat insulation to the duct.

JP 2003-42389 A

  However, in the duct of Patent Document 1, the heat-shrinkable foamed resin sheet is covered over the entire outer peripheral surface (the entire surface) of the cylindrical duct body. For this reason, a heat-shrinkable foamed resin sheet having a large area is required, and a technique capable of effectively insulating the duct body with less material is desired.

  This invention is made | formed in view of such a situation, The objective is to provide the duct which can improve heat insulation effectively with less material.

In order to achieve such an object, the present invention is grasped by the following configuration.
(1) The present invention is a duct including a duct main body that forms a fluid flow path, and has a heat insulating portion provided on a surface of the duct main body, and the heat insulating portion partially covers a surface of the duct main body. And an air layer formed between the surface of the duct main body and the coating layer.

  According to this structure, since the heat insulation part was comprised by the coating layer which partially covers the surface of a duct main body, a heat insulation part can be provided only in the part which needs heat insulation in a duct main body. Thereby, compared with the conventional duct which coat | covers the whole outer peripheral surface of a duct main body with a heat-shrinkable foamed resin sheet, heat insulation can be improved effectively with less material.

(2) In the present invention, in the configuration of (1), the heat insulating portion is provided in a ring shape on the surface of the duct main body and is closed by the covering layer to form the air layer; It is provided in the area | region enclosed by the said frame body among the surfaces of a duct main body, It has a convex part which divides the said air layer into several air chamber, It is characterized by the above-mentioned.

  According to this configuration, air in the air layer is confined in each of the plurality of partitioned air chambers. That is, air does not move between two adjacent air chambers. Thereby, the heat leak by the movement of air in an air layer can be prevented, and heat insulation can be improved more.

(3) In the present invention, in the configuration of (2), the convex portions are a plurality of ribs extending along the surface of the duct body, and the plurality of ribs are arranged in a lattice shape. And

  According to this configuration, the coating layer can be stably supported by the plurality of ribs regularly arranged in a lattice shape. In addition, since the plurality of air chambers can be formed with substantially the same volume, it is possible to achieve uniform heat insulation.

(4) According to the present invention, in the configuration of (3), the interval between two adjacent ribs is set in a range of 5 to 15 mm.

  According to this configuration, by setting the interval between two adjacent ribs within a range of 5 to 15 mm, it is possible to improve the heat insulation of the air layer and stabilize the form of the coating layer. On the other hand, if the interval between two adjacent ribs is set to less than 5 mm, the volume of the air layer is reduced, and sufficient heat insulation may not be obtained. On the other hand, if the interval between two adjacent ribs is set to be greater than 15 mm, the coating layer is likely to bend between the two adjacent ribs, so that the shape of the coating layer may become unstable.

(5) In the present invention, in the configuration of (3) or (4), the height of the rib is set to 1 mm or more.

  According to this structure, the volume of an air layer can be increased by setting the height of a rib to 1 mm or more, and high heat insulation can be provided to an air layer.

(6) In this invention, the structure in any one of (1)-(5) WHEREIN: The said coating layer is comprised with the material provided with a sound absorption effect | action.

  According to this configuration, since a sound absorbing action can be obtained in the coating layer, the soundproofing property in the duct can be enhanced.

(7) In the present invention, in the configuration of (6), the duct main body has an opening at a downstream end, and the heat insulating portion is disposed in the vicinity of the opening. To do.

  According to this configuration, a sound absorbing action can be obtained in the vicinity of the opening where the blowing sound is likely to occur. Thereby, the soundproofing property in a duct can be improved effectively.

(8) In the present invention, in any one of the constitutions (1) to (7), the duct body has a bent portion that bends the flow path, and the heat insulating portion bulges outward at the bent portion. It is provided on a convex surface and is arranged on the downstream side.

  According to this configuration, when a cold fluid flows through the flow path, it is possible to effectively suppress the occurrence of condensation in the duct body. That is, in the bent portion, the fluid tends to hit the back surface (inner surface) of the wall portion that swells outward, so that dew condensation tends to occur on the convex surface (outer surface) of the wall portion that bulges outward. In the present invention, since the heat insulating portion is provided on the convex surface where condensation is likely to occur, the occurrence of condensation can be effectively prevented. Further, in the bent portion, a cold fluid is likely to hit the downstream side of the back surface of the wall portion bulging outward. In this invention, since the heat insulation part was arrange | positioned near the downstream in the bending part, generation | occurrence | production of dew condensation can be prevented more effectively.

(9) In the present invention, in any one of the constitutions (1) to (8), the duct main body has a portion recessed downward, and the heat insulating portion is formed below the portion recessed downward. It is arranged on a convex surface.

  According to this configuration, it is possible to impart heat insulation to the surface on which condensation easily collects, so that the occurrence of condensation can be effectively suppressed. That is, condensation tends to collect on the convex surface formed on the lower side of the concave portion, and in some cases, condensation will hang down from the convex surface. In the present invention, since the heat insulating portion is provided on the convex surface where condensation easily collects in this way, it is possible to effectively prevent the occurrence of condensation.

(10) In the present invention, in any one of the constitutions (1) to (9), the duct main body is a foamed molded body formed by foaming a resin with a foaming agent.

  According to this structure, even if it is a case where a duct main body is comprised with the soft foaming molding, a duct main body is reinforced with a heat insulation part. Therefore, the rigidity of the duct body made of the foamed molded product can be increased by the heat insulating portion.

  ADVANTAGE OF THE INVENTION According to this invention, the duct which can improve heat insulation effectively with less material can be provided.

It is a top view of the duct concerning the present invention. It is a perspective view of the basic composition of the heat insulation part of a duct. FIG. 3 is an exploded view of FIG. 2. It is the DD sectional view taken on the line of FIG. It is the A section enlarged view of FIG. It is a figure which expands and shows the horizontal cross section of the B section of FIG. It is CC sectional view taken on the line of FIG.

(Embodiment)
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the accompanying drawings. The same number is attached | subjected to the same element through the whole description of embodiment. The drawings are viewed in the direction of the reference numerals.

(Overall configuration of duct 10)
The overall configuration of the duct 10 will be described with reference to FIG.
As shown in FIG. 1, the duct 10 is an air conditioning duct provided on the back side of an instrument panel (not shown) of a vehicle, and has flow paths 11A and 11B for air (an example of “fluid” in the present invention). The duct main body 20 to be formed and a plurality of heat insulating portions 30A, 30B, and 30C provided in places where heat insulation is necessary in the duct main body 20 are provided.

(Configuration of duct body 20)
The duct body 20 is, for example, a synthetic resin molded body formed by blow molding, and includes a base portion 21 and a plurality of cylindrical portions 22A and 22B that are branch pipes branched from the base portion 21. As the molding material for the duct body 20, various resins including polyolefin resins such as polyethylene and polypropylene can be used. The duct 10 is preferably a foamed molded article formed by foaming a resin with a foaming agent in consideration of lightness and the like. As the foaming agent, a physical foaming agent, a chemical foaming agent and a mixture thereof can be used.

  The base 21 is formed at the center in the left-right direction of the duct 10. The base 21 is provided with an introduction port 23. This introduction port 23 is an upstream end of the flow paths 11A and 11B, and is connected to a vehicle air conditioner (not shown).

  The cylindrical portions 22A and 22B are composed of a pair of left and right cylindrical portions 22A and a pair of left and right cylindrical portions 22B provided outside the pair of cylindrical portions 22A. The left and right tube portions 22A extend outward from the base portion 21 in a square shape in plan view, and then bend inward by the bent portions 25A that bend the flow path 11A and extend in parallel with each other. The downstream end of the cylindrical portion 22A has an opening 26A, and the opening 26A constitutes a blowout port for blowing air into the passenger compartment.

  On the other hand, the left and right cylindrical portions 22B extend from the base portion 21 to the left and right sides and then bend inward by a bent portion 25B that bends the flow path 11B. The downstream end of the cylindrical portion 22B has an opening 26B, and this opening 26B constitutes a blow-out port that blows air into the passenger compartment. Further, the cylindrical portion 22B has a valley portion 27 between the base portion 21 and the bent portion 25B. The valley-shaped portion 27 corresponds to a “portion recessed downward” in the present invention, and bends the cylindrical portion 22B in the vertical direction.

(Basic configuration of the heat insulating portions 30A to 30C)
Next, the basic configuration and functions / effects of the heat insulating portions 30A to 30C will be described with reference to FIGS. In addition, each structure and effect | action and effect of heat insulation part 30A-30C are mentioned later.

  In the description of the basic configuration, the heat insulating portions 30A to 30C are collectively referred to as “heat insulating portion 30”. Further, the cylinder portions 22A and 22B are collectively referred to as “cylinder portion 22”, and the flow paths 11A and 11B are collectively referred to as “flow path 11”.

  As shown in FIG. 2, the heat insulating portion 30 partially covers the surface 33 of the cylindrical portion 22 by closing the frame 31 and the convex portion 32 provided on the surface 33 of the cylindrical portion 22 and the open side of the frame 31. The main element is a covering layer 35 and an air layer 36 formed between the surface 33 of the cylindrical portion 22 and the covering layer 35. Although the heat insulation part 30 can be formed in arbitrary shapes, such as planar shape and curved surface shape, according to the shape of the surface 33 of the cylinder part 22, here, among the surfaces 33 of the cylinder part 22 whose cross section is a rectangular shape The heat insulating part 30 formed in a planar shape along the surface 37 on the relatively wide long side is illustrated.

  As shown in FIG. 3, the frame body 31 is an annular (in this example, a quadrangular) protrusion provided on the long-side surface 37, and is closed by the covering layer 35 to form the air layer 36. The width of the frame 31 is set to the same size as the width of the long side surface 37. The shape of the frame 31 may be a circular shape, an elliptical shape, or a polygonal shape in addition to a rectangular shape such as a rectangular shape or a square shape.

  The convex portion 32 is provided in a region surrounded by the frame body 31 on the long side surface 37. In this example, the convex part 32 is comprised by the some rib 32a extended along the surface 37 of a long side. The plurality of ribs 32a are arranged in a lattice shape. Moreover, the height of the some rib 32a and the frame 31 is set to a comparable magnitude | size.

  The air layer 36 is a heat insulating space surrounded by the frame body 31, and is partitioned into a plurality of rectangular air chambers 36a by a plurality of ribs 32a (convex portions 32) arranged in a lattice shape.

  As shown in FIG. 4, the covering layer 35 is a sealing material formed in a shape (in this example, a quadrangular shape) that matches the outer shape of the frame 31, and closes the open side of the frame 31. Then, the cylindrical portion 22 is bonded to the surface 33 (for example, the short side surface 38), the tip of the frame 31, and the tip of the rib 32a. As a result, the plurality of air chambers 36a are hermetically sealed by the open side of each of them being covered with the coating layer 35.

  The constituent material of the covering layer 35 is arbitrary, but considering the soundproofing property of the duct 10, it is preferable that the covering layer 35 is made of a material having a sound absorbing action. Examples of the material having a sound absorbing effect include a nonwoven fabric, a woven fabric, an open-cell foamed sheet (for example, a foamed urethane sheet), and a non-breathable sheet having fine holes. In addition, you may enable it to selectively absorb the sound of a specific frequency by adjusting the structural material of the coating layer 35, and the form of the air chamber 36a.

Here, the suitable dimension of the rib 32a in the heat insulation part 30 is described.
As a result of investigating the relationship between the dimension of the rib 32a and the performance of the heat insulating portion 30, the inventor sets the interval P (see FIG. 3) between the two adjacent ribs 32a from a range of 5 to 15 mm, It has been found that it is preferable to set the height H to 1 mm or more.

  That is, if the interval P between the two adjacent ribs 32a is set to less than 5 mm, the volume of the air layer 36 is reduced, and sufficient heat insulation may not be obtained. On the other hand, if the interval P between the two adjacent ribs 32a is set to be larger than 15 mm, the covering layer 35 is likely to bend between the two adjacent ribs 32a, so that the form of the covering layer 35 may become unstable. . Therefore, by setting the interval P between the two adjacent ribs 32a within the range of 5 to 15 mm, the heat insulation of the air layer 36 can be improved and the shape of the coating layer 35 can be stabilized.

  Further, by setting the height H of the rib 32a to 1 mm or more, the volume of the air layer 36 can be increased, and high heat insulation can be imparted to the air layer 36.

  As described above, according to the duct 10 described above, the heat insulating portion 30 is configured by the covering layer 35 that partially covers the surface 33 of the cylindrical portion 22. be able to. Thereby, compared with the conventional duct which coat | covers the whole outer peripheral surface of a duct main body with a heat-shrinkable foamed resin sheet, heat insulation can be improved effectively with less material.

  Further, the air in the air layer 36 is confined in each of the plurality of partitioned air chambers 36a. That is, air does not move between the two adjacent air chambers 36a. Thereby, the heat leak by the movement of air in the air layer 36 can be prevented, and heat insulation can be improved more.

  Further, the coating layer 35 can be stably supported by the plurality of ribs 32a regularly arranged in a lattice shape. In addition, since the plurality of air chambers 36a can be formed with substantially the same volume, it is possible to achieve uniform heat insulation.

  Furthermore, if the coating layer 35 is made of a material having a sound absorbing effect, the soundproofing property in the duct 10 can be improved. For example, when the covering layer 35 is made of a material having air permeability, sound energy is attenuated by applying sound from the inside of the duct body 20 (flow path 11) to the air-permeable covering layer 35. Can do.

  In addition, it is a case where the duct main body 20 is comprised with a soft foaming molding, Comprising: The duct main body 20 is reinforced with the rib 32a. The duct body 20 is also reinforced by the covering layer 35. Therefore, the rigidity of the duct body 20 made of the foamed molded body can be increased by the heat insulating portion 30.

  Then, each structure and effect | action and effect of heat insulation part 30A-30C are demonstrated based on FIGS.

(Configuration of heat insulating part 30A)
As shown in FIG. 5, the heat insulating portion 30 </ b> A has a heat insulating portion 30 (see FIG. 3) as a basic configuration, and is provided in the vicinity of the opening 26 </ b> A in the cylindrical portion 22 </ b> A. More specifically, on the surface 33 of the cylindrical portion 22A, the central portion of the heat insulating portion 30A is positioned at a position separated from the opening 26A by a distance L (for example, about 10 cm) and covered with a material having a sound absorbing effect. Layer 35 is formed.

  According to the heat insulating part 30A, a sound absorbing action can be obtained in the vicinity of the opening 26A where the blowing sound is likely to be generated. Thereby, the soundproofing property in the duct 10 can be improved effectively.

(Configuration of heat insulating part 30B)
As shown in FIG. 6, the heat insulating part 30 </ b> B has a basic structure of the heat insulating part 30 (see FIG. 3), is provided on the convex surface 41 </ b> B that bulges outward at the bent part 25 </ b> B, and is located downstream Be placed. More specifically, the heat insulating portion 30B is formed in a curved shape in accordance with the curvature of the convex surface 41B, and the center position P1 of the heat insulating portion 30B in the direction along the axis of the flow path 11B indicated by the arrow F is It arrange | positions downstream from the center position P1 of the bending part 25B.

  According to this heat insulating part 30B, when cold air flows through the flow path 11B, it is possible to effectively suppress the occurrence of condensation in the cylindrical part 22B. That is, in the bent portion 25B, as indicated by the white arrow, since the cold air is likely to hit the back surface (inner surface) 43 of the wall portion 42 bulging outward, the convex surface (outer surface) of the wall portion 42 bulging outward ) Condensation is likely to occur on 41B. Therefore, by providing the heat insulating portion 30 on the convex surface 41B where condensation is likely to occur, the occurrence of condensation can be effectively prevented. Further, in the bent portion 25B, cold air is likely to hit the downstream surface 43 of the wall portion 42 that bulges outward. For this reason, the arrangement | positioning of the heat insulation part 30 in downstream side in the bending part 25B can prevent generation | occurrence | production of condensation more effectively.

(Configuration of heat insulating part 30C)
As shown in FIG. 7, the heat insulating part 30 </ b> C has the heat insulating part 30 (see FIG. 3) as a basic configuration, and is provided on a convex surface 41 </ b> C formed below the valley-like part 27. More specifically, the heat insulating portion 30 </ b> C formed in a curved shape in accordance with the curvature of the convex surface 41 </ b> C is disposed on the convex surface 41 </ b> C including the lowest end 45 of the valley-shaped portion 27.

  According to this heat insulating part 30C, heat generation can be imparted to the convex surface 41C where condensation easily collects, so that the occurrence of condensation can be effectively suppressed. That is, in the valley-shaped portion 27, condensation is likely to collect near the lowermost end 45 of the convex surface 41C, and in some cases, condensation condenses from the vicinity of the lowermost end 45. Therefore, by providing the heat insulating portion 30 on the convex surface 41C where condensation easily collects in this way, it is possible to effectively prevent the occurrence of condensation.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. Further, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  For example, in the embodiment, an example in which the duct of the present invention is applied to an air conditioning duct for a vehicle is shown. However, the duct of the present invention includes a duct main body that forms a fluid flow path in addition to an air conditioning duct for a vehicle. It can be applied to various types of ducts.

  Moreover, in embodiment, although the duct 10 which has the heat insulation parts 30A-30C was shown, the heat insulation part said to this invention may combine the heat insulation parts 30A-30C suitably. Moreover, the duct of this invention may have selectively the heat insulation parts 30A-30C.

DESCRIPTION OF SYMBOLS 10 Duct 11A Flow path 11B Flow path 20 Duct main body 25A Bending part 25B Bending part 26A Opening part 26B Opening part 27 Valley part (part dented downward)
30A heat insulation part 30B heat insulation part 30C heat insulation part 31 frame 32 convex part 32a rib 33 surface of cylinder part (surface of duct main body)
35 Covering layer 36 Air layer 36a Air chamber 41B Convex surface 41C Convex surface H Rib height P Rib spacing

Claims (10)

A duct comprising a duct body made of a cylindrical blow molded body that forms a fluid flow path,
A frame integrally formed with the duct body and provided in an annular shape on the surface of the duct body;
A convex portion that is integrally formed with the duct body and is provided in an area surrounded by the frame body on the surface of the duct body;
Anda heat insulating portion provided on the surface of the duct body,
The heat insulating part is
A coating layer that is adhered to the tip of the frame and the tip of the convex part, and partially covers the surface of the duct body;
An air layer formed between the surface of the duct body and the covering layer;
I have a,
The air layer is formed by closing the frame body with the covering layer, and is partitioned into a plurality of air chambers by the convex portion.
A duct characterized by that. The convex portions are a plurality of ribs extending along the surface of the duct body,
The plurality of ribs are arranged in a lattice shape,
The duct according to claim 1 . The interval between the two adjacent ribs is set from a range of 5 to 15 mm .
The duct according to claim 2 . The height of the rib is set to 1 mm or more ,
The duct according to claim 2 or 3 , characterized in that. The covering layer is made of a material having a sound absorbing action ,
The duct according to any one of claims 1 to 4 , wherein the duct is provided. The duct body has an opening at the downstream end,
The heat insulating portion is disposed in the vicinity of the opening.
The duct according to claim 5 . The duct body has a bent portion for bending the flow path,
The heat insulating portion is provided on a convex surface that bulges outward in the bent portion, and is disposed on the downstream side.
The duct according to any one of claims 1 to 6 , characterized by that. The heat insulating portion is arranged such that the central position in the axial direction of the flow path is closer to the downstream than the central position of the bent portion in the axial direction of the flow path.
The duct according to claim 7 . The duct body has a portion recessed downward,
The heat insulating portion is disposed on a convex surface formed on the lower side of the portion recessed downward.
The duct according to any one of claims 1 to 8 , characterized by that. The duct body is a foam molded body formed by foaming a resin with a foaming agent .
The duct according to any one of claims 1 to 9 , characterized by that.

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