JP2011251638A - Air conditioning duct for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the occurrence of dew condensation on an outer surface of a tubular duct body and also exert sound absorbability for sounds outside the duct by providing a foam body along the outer surface of the duct body.SOLUTION: A foam body 21 made of, for example, polyurethane foam, is formed with a plurality of slits 24 and 25 intersecting with each other from two directions in a face 23 on the opposite side, in a thickness direction of the foam body 21, of a face 22 for being adhered to a duct body 11, and the adhering face 22 is left without any slit. The foam body 21 formed with the plurality of slits 24 and 25 intersecting with each other from the two directions is adhered to an outer surface of the plastic duct body 11 so that the occurrence of the dew condensation is suppressed and the sound absorbability is exerted by the foam body 21 on the outer surface of the duct body 11.

Description

  The present invention relates to a vehicle air conditioning duct provided on the back side of a vehicle ceiling, the back side of an instrument panel, or the like.

  Conventionally, an air conditioning duct is provided on the back side of a vehicle instrument panel or on the back side of a ceiling of a one-box car, etc., so that temperature-controlled air blown out from the vehicle air conditioner is guided to the air outlet in the vehicle interior by the air conditioning duct. It is configured.

  In a vehicle air conditioning duct, temperature-controlled air blown out from a vehicle air conditioner passes through the interior, so a temperature difference tends to occur between the inner surface and the outer surface of the duct, and condensation occurs on the outer surface of the duct due to the temperature difference. There is a risk that water droplets due to condensation may drip from the outer surface of the duct and wet the parts below the duct.

  Conventionally, as a method for preventing the occurrence of the dew condensation, a sheet-like polyurethane foam is applied as a heat insulating material to the entire surface of the outer surface of the duct where it is necessary to prevent dew condensation using a double-sided adhesive tape or the like (Patent Documents 1 to 3) 3). However, although polyurethane foam with double-sided adhesive tape is flexible, it is difficult to say that it is easy to stretch.Therefore, when polyurethane foam is applied to the outer surface of the duct, the polyurethane foam does not stretch at the corners of the outer surface of the duct. It is easy to cause wrinkles and misalignment due to the above, and re-sticking may be necessary.

  In addition, the vehicle duct provided on the back side of the vehicle interior member such as the vehicle ceiling and the instrument panel prevents the sound outside the vehicle and the sound of the engine room from being transmitted to the vehicle interior via the duct. It is required to improve sound absorption.

  As a method for increasing the sound absorption of the outer surface of the duct, a method of increasing the thickness of the polyurethane foam provided on the outer surface of the duct for preventing condensation is conceivable. Since the polyurethane foam is made of a porous material, it also acts as a sound absorbing material. When the polyurethane foam is provided on the outer surface of the duct, it can prevent the sound outside the vehicle and the sound of the engine room from being transmitted to the duct. However, when the thickness of the polyurethane foam is increased, the repulsive force against bending is increased and the flexibility of the polyurethane foam is reduced, making it difficult to attach the polyurethane foam to the outer surface of the duct. The problem is that foam wrinkles are more likely to occur, the polyurethane foam is likely to be misaligned, and it is necessary to re-apply it many times, and the part between the outer surface near the corner of the duct and the polyurethane foam. Therefore, there is a problem that the effect of preventing condensation and the sound absorbing effect are lowered due to the gap.

  As a dew condensation prevention duct, it has been proposed that a plurality of slits are formed in a sheet-like foam, and the slit portion is expanded to form a net-like water absorbing member on the outer surface of the tubular duct body. (Patent Document 4).

  In a duct having a net-like water-absorbing member provided on the outer surface of the duct body, heat insulation is enhanced in the portion where the water-absorbing member is present, and the amount of condensation generated on the outer surface of the duct body can be suppressed. Even if dew condensation occurs in the non-existing mesh part, when water droplets due to condensation flow along the outer surface of the duct body, they contact with the net-like water absorbing member and are absorbed by the water absorbing member, so that the water droplets drip from the outer surface of the duct Can be prevented.

  However, a duct having a net-like water-absorbing member provided on the outer surface of the duct main body is not sufficient in terms of sound absorption because the duct main body is exposed at the mesh portion of the water-absorbing member.

Japanese Utility Model Publication No. 6-75742 JP 7-257149 A JP-A-2005-47421 JP 2007-216849 A

  The present invention has been made in view of the above points, and is capable of suppressing the occurrence of dew condensation by the foam provided on the outer surface of the tubular duct body, and has good sound absorption, and further, the tubular duct body. When sticking foam to the outer surface of the duct, it is easy to attach the foam to the outer surface of the duct body so that the foam can be properly attached, and it is difficult to form a gap between the foam and the outer surface of the duct body. It aims at providing the duct which can heighten the prevention effect and the sound absorption effect.

  The invention of claim 1 comprises a tubular duct main body and a sheet-like flexible foam provided on the outer surface of the duct main body, and the foam is on the opposite side of the duct main body. Further, the present invention relates to a vehicle duct, wherein a plurality of cuts are formed leaving the sticking side, and the foam in which the cuts are formed is stuck to an outer surface of the duct body.

  According to a second aspect of the present invention, in the first aspect, the cuts are formed so as to intersect each other.

  The invention of claim 3 is characterized in that, in claim 1 or 2, the cut is formed intermittently in the extending direction of the cut.

  ADVANTAGE OF THE INVENTION According to this invention, heat insulation improves by the sheet-like foam stuck on the outer surface of the duct main body, and the dew condensation which generate | occur | produces on the outer surface of a duct can be suppressed. In addition, since the foam adhered to the outer surface of the duct body is a porous body, the sound absorbing property on the outer surface of the duct is good.

  Further, according to the present invention, the foam adhered to the outer surface of the duct main body is formed on the side opposite to the adhesion side to the duct main body, with a plurality of cuts leaving the adhesion side. For this reason, the deformability of the foam is increased in the direction in which the notch is opened, and the foam is easily stretched. Therefore, when adhering the foam to the outer surface of the duct body, the foam can easily adhere to the outer surface of the duct body and can be adhered to the outer surface of the duct body, and between the foam and the outer surface of the duct body. It is difficult to create a gap in the surface. In addition, the cut formed on the side opposite to the side of the foam body sticking to the duct body is formed leaving the side of the duct body sticking to the foam body sticking side. Therefore, the outer surface of the duct body is covered with the foam even at the cut portion of the foam. Therefore, the heat insulating property of the outer surface of the duct is improved by the foam, the effect of preventing dew condensation is increased, and the sound absorption is also improved. In addition, the notch formed on the opposite side of the foam body to the duct body is stretched when the foam body is adhered to the outer surface of the duct body along the outer shape of the duct body. As a result, the surface area of the foam increases at the cut portion, which also improves the sound absorption on the outer surface of the duct.

  Furthermore, in order to further improve the dew condensation prevention effect and sound absorption, even if the thickness of the foam is increased, the notch formed in the foam ensures the flexibility, deformability and ease of elongation of the foam. Therefore, the foam easily adheres to the outer surface of the duct main body when sticking to the outer surface of the duct main body, and is less likely to form a gap between the outer surface of the duct main body and adhere to the outer surface of the duct main body. Can be improved.

  Further, in the present invention, by forming the notches so as to cross each other, the deformability of the foam is further ensured, so that the foam easily follows the outer surface of the duct body that bends in a complicated manner. Furthermore, after the foam is attached to the duct body, the side opposite to the side where the foam is attached to the duct body has a large uneven shape due to the opening of the intersection of the cuts, so that the sound absorption is further improved.

It is the perspective view of the duct of 1st Embodiment in this invention, and the one part enlarged view. It is a perspective view of a duct main part and a foam of a 1st embodiment. It is a perspective view of the duct of a 2nd embodiment.

  The vehicle duct 10 shown in FIG. 1 has a vehicle air conditioner and one end side 15 connected, and the other end 17 connected to an air outlet in the vehicle compartment. Guide air to the air outlet. The vehicle duct 10 includes a duct body 11 and a sheet-like foam 21.

  As shown in FIG. 2, the duct main body 11 is made of a plastic tubular body, and the inside serves as an air flow passage 12. The duct body 11 has a predetermined size, a cross-sectional shape (such as a circle, an ellipse, or a rectangle) and a bent shape depending on the installation location. Further, the duct body 11 may be any one formed into a tubular shape by blow molding, or one formed by combining tubular halves formed by injection molding or the like.

  The foam 21 is attached to the outer surface of the duct main body 11, suppresses condensation that occurs on the outer surface of the duct main body 11, and absorbs sound transmitted from the outside of the duct 10 to the duct main body 11. The foam 21 is provided on a predetermined portion of the outer surface of the duct body 11, for example, a portion where condensation easily occurs, or the entire outer surface of the duct body 11, and is fixed to the outer surface of the duct body 11 with a double-sided adhesive tape, an adhesive, or the like. The

  The foam 21 is not particularly limited as long as it is made of a porous material and has flexibility. Examples of the foam 21 include foams such as polyurethane foam and polyolefin foam. Among them, a flexible polyurethane foam or a polyolefin foam is preferable because it has good flexibility, light weight, good heat insulation and sound absorption. The thickness of the foam 21 is set to an appropriate value, but is preferably about 2 to 10 mm from the viewpoints of heat insulation, sound absorption, flexibility at the time of sticking to the outer surface of the duct body 11, and the like.

  The foam 21 has a plurality of cuts 24 and 25 intersecting the two directions D1 and D2 on the side 23 opposite to the side 22 to which the duct body 11 is attached. One cut 24 indicates a cut in the D1 direction, and the other cut 25 indicates a cut in the D2 direction. In this embodiment, the two directions D1 and D2 are two directions orthogonal to each other, and in this embodiment, the foam 21 is formed in a rectangular sheet shape as shown in FIG. The vertical direction parallel to the side 26 is the D1 direction, the horizontal direction parallel to the long side 27 of the foam 21 is the D2 direction, and the two-way cuts 24 and 25 are the vertical cut 24 and the horizontal direction. The notch 25 is.

  The notches 24 and 25 are formed leaving a predetermined amount of the affixing side 22 to the duct body 11. That is, the notches 24 and 25 are formed partway along the thickness direction T of the foam 21 from the opposite side 23 of the foam 21 to the duct main body 11 on the side 22 where the foam 21 is pasted. The wearing side 22 is left in a predetermined amount, for example, about 0.5 to 2 mm without being cut. The distances L1 and L2 between the notches 24 and 25 in each direction are set to appropriate values, but in order to improve the flexibility and elongation of the foam 21, L1 and L2 are preferably about 5 to 10 mm.

  In the present embodiment, the cuts 24 and 25 are intermittently formed in the extending direction of the cuts 24 and 25 (that is, the extending direction of the cuts) as shown by broken lines and perforations. By providing the notches 24 and 25 intermittently, a partial strength reduction of the foam body 21 can be suppressed, and the foam body 21 when the foam body 21 is adhered along the outer surface of the duct body 11. It is possible to prevent the foam 21 from being broken at the cut portions 24 and 25 due to the pulling of the material. When the cuts 24 and 25 are provided intermittently, the cuts 24 in one direction and the cuts 25 in the other direction intersect each other as shown in FIGS. preferable. As described above, when the two-way cuts 24 and 25 intersect to divide the other-side cut, the foam 21 is more easily deformed at the intersecting portion 28 of the two-way cuts 24 and 25. Is more easily attached to the outer surface of the duct body 11.

  The duct 100 of the second embodiment shown in FIG. 3 is formed by forming continuous cuts 240 and 250 in the foam 210 instead of the intermittent cuts 24 and 25 in the first embodiment. The foam 210 is the same as the foam 21 of the first embodiment except that the notches 240 and 250 are continuously formed. Reference numeral 220 is a sticking side to the duct body 11, and 230 is a side opposite to the sticking side. One cut 240 indicates a cut in the D1 direction, and the other cut 250 indicates a cut in the D2 direction. Other configurations in the second embodiment are the same as the corresponding configurations in the first embodiment.

  In the duct 100 of the second embodiment, the ease of deformation of the foam 210 is increased by the continuous cuts 240 and 250 formed in the foam 210, so that the outer surface of the duct body 11 has a complicated curved shape. Even if it exists, it becomes easy to stick the foam 210 along the outer surface of the duct main body 11, and the dew condensation prevention and sound absorption property of a duct outer surface can be made favorable.

  In the present invention, the cuts may not cross each other. For example, a plurality of cuts extending in one direction may be provided in parallel, or cuts extending (existing) intermittently may be provided in two directions so that the cuts do not intersect each other.

10,100 Duct 11,11 Duct body 21,210 Foam 22,220 Adhering side to duct body 23,230 Opposite side 24,25,240,250

Claims (3)

A tubular duct body;
It consists of a sheet-like flexible foam provided on the outer surface of the duct body,
The foam is formed on the opposite side of the duct body from the sticking side, and a plurality of cuts are formed leaving the sticking side,
The duct for vehicles, wherein the foam in which the cut is formed is adhered to the outer surface of the duct body.   The vehicular duct according to claim 1, wherein the cuts are formed so as to intersect each other.   3. The vehicle duct according to claim 1, wherein the cuts are formed intermittently in the extending direction of the cuts.

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