JP4942357B2 - Manufacturing method for air conditioning duct for vehicle - Google Patents

Description

  The present invention relates to a method for manufacturing an air conditioning duct for a vehicle that guides air blown from an air conditioner of a vehicle to an air outlet in a vehicle compartment.

  In the air conditioning duct for vehicles, the temperature adjustment air blown out from the vehicle air conditioner passes through the inside, so that a temperature difference is likely 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 the water droplets from the sag 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 heat insulating material such as a nonwoven fabric or a urethane sheet is applied to the entire surface of the outer surface of the duct where it is necessary to prevent dew condensation. However, this method has a problem that the material cost increases because the amount of the heat insulating material used is large. And it was not easy to stick a heat insulating material along the outer surface of a duct.

  In addition, as a method for preventing water from being collected due to condensation generated on the outer surface of the duct to form water droplets, a method in which lattice-like ribs are erected on the outer surface of the duct has been proposed. However, this method has a problem that the occurrence of condensation itself cannot be suppressed.

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

  The present invention has been made in view of the above points, and it is possible to suppress the amount of condensation by using a water absorbing member, and to reduce the amount of water absorbing material used and to absorb water along the outer surface of the duct body. It is an object of the present invention to provide a method for manufacturing an air conditioning duct for a vehicle in which a member can be easily attached and water droplets do not easily drip even when condensation occurs.

The invention according to claim 1 is a direction in which the slit expands a water absorbing member made of a foam having flexible sheet-like continuous air holes in which a plurality of slits are formed at predetermined intervals on the outer surface of the duct body. A method for manufacturing a vehicle air-conditioning duct, wherein the air-conditioning duct for a vehicle is attached to the outer surface of the main body while being stretched and the slit is widened and attached in a net shape.

  According to a second aspect of the present invention, in the first aspect, the water absorbing member is made of a foam.

  According to the invention of claim 1, since the net-like water-absorbing member is attached to the outer surface of the duct body, the 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 is suppressed. Can do. In addition, even if dew condensation occurs in the mesh portion where there is no water absorbing member, 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. It can prevent dripping from the outer surface of the duct. In addition, since the net-like water-absorbing member has a mesh space, the amount of the water-absorbing member can be reduced and the cost can be prevented from increasing.

  According to the invention of claim 1, the net-like water-absorbing member is formed into a net-like shape by forming a plurality of slits at predetermined intervals in the flexible sheet-like water-absorbing member and expanding the slit portions. Therefore, the material yield is good and the manufacture is easy.

According to invention of Claim 1 , since the water absorption member is comprised with the foam, the water absorption member of the outer surface of a duct main body exhibits a buffering effect, and can protect a duct main body. Furthermore, if the foam has continuous ventilation holes, even if dew condensation occurs on the outer surface of the duct body, moisture due to condensation can be satisfactorily introduced into the foam body, that is, the net-like water-absorbing member by the continuous ventilation holes of the foam. Can be absorbed.

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a perspective view of a vehicle air-conditioning duct according to an embodiment of the present invention and a partial enlarged view thereof. FIG. 2 is a schematic cross-sectional view taken along line AA of FIG. FIG. 4 is a perspective view showing a net-like water-absorbing member obtained by expanding a sheet-like water-absorbing member having flexibility at a slit portion.

  The vehicle air conditioning duct 10 shown in FIGS. 1 and 2 has one end connected to the vehicle air conditioner and the other end connected to an air outlet in the vehicle cabin, and is controlled by the temperature of the vehicle air conditioner. Air is guided to the air outlet. The vehicle air conditioning duct 10 includes a duct body 11 and a net-like water absorbing member 21.

  The duct body 11 is made of a plastic cylindrical body, and has an air flow passage 12 inside. 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 main body 11 may be either a cylinder formed by blow molding or a cylinder formed by combining cylindrical halves formed by injection molding or the like.

  The net-like water-absorbing member 21 is attached to the outer surface of the duct body 11 and suppresses the amount of condensation that occurs on the outer surface of the duct body 11. Even if condensation occurs on the outer surface of the duct body 11 and water droplets are generated due to the condensation, the water droplets are absorbed by the net-like water absorbing member 21 when traveling along the outer surface of the duct body 11. 10 can be prevented from drooping. The net-like water-absorbing member 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 an adhesive or the like. Is done. The mesh 22 has an appropriate size, and examples include 5 to 100 meshes in a 10 cm square.

  The net-like water-absorbing member 21 is not particularly limited as long as it has water absorption, and examples thereof include non-woven fabrics, felts, polyurethane foams, and the like. Among them, a flexible foam (for example, a soft polyurethane foam) is preferable. If the net-like water-absorbing member 21 is formed of a flexible foam, the net-like water-absorbing member 21 can easily follow the outer surface of the duct main body 11 when attached to the outer surface of the duct main body 11. The water absorbing member 21 can be brought into close contact. Therefore, it is possible to prevent a gap from being generated between the outer surface of the duct body 11 and the net-like water-absorbing member 21, and to prevent a decrease in the water absorption of condensed water due to the gap. When the net-like water absorbing member 21 is made of a flexible foam, the outer surface of the duct main body 11 can be protected by the cushioning property of the foam. Even if the duct 10 collides with other members or the like, the duct main body 11 can be prevented from being damaged.

  The flexible foam preferably has continuous air holes. If there is a continuous air hole, even if dew condensation occurs on the outer surface of the duct body 11, moisture due to the dew condensation can be satisfactorily absorbed into the foam, that is, the net-like water absorbing member 21 by the continuous air hole of the foam. it can. As the foam having the continuous air holes, a flexible polyurethane foam is preferable because it is excellent in heat insulating properties, buffer properties, lightness, and the like.

  As shown in FIG. 3, the net-like water-absorbing member 21 is formed by forming a plurality of slits 22A at a predetermined interval in a flexible sheet-like water-absorbing member 21A, and the flexible sheet-like water-absorbing member 21A. It is preferable that the portion of the slit 22A is expanded by pulling outward to E to form a mesh 22 as shown in FIG. According to this, unlike the mesh formation by punching, no wasteful portion is generated, so that the material yield is good, the material cost can be reduced, and the manufacture is easy. Moreover, when the flexible sheet-like water absorbing member 21A formed with the slit 22A is applied to the outer surface of the duct body 11 while being pulled outward E, the slit 22A is expanded to form a mesh 22. Therefore, workability is excellent. In the illustrated example, the plurality of slits 22A are alternately formed in parallel at predetermined intervals, and the flexible sheet-like water absorbing member 21A is pulled to the outside E substantially orthogonal to the slits 22A. Thus, the portion of the slit 22A is expanded. The flexible sheet-like water absorbing member 21A has an appropriate thickness, and an example is one having a thickness of 3 to 15 mm.

  Further, the flexible sheet-like water absorbing member 21A is preferably a slab foamed product cut to a predetermined thickness. In the case where the slab foam product is cut, the surface of the flexible sheet-like water-absorbing member 21A is constituted by a cut surface, and the ratio of pores opened on the surface increases. Therefore, the ratio of the open pores increases on the surface of the net-like water-absorbing member 21, and even if dew condensation occurs on the outer surface of the duct body 11, moisture due to condensation enters the net-like water-absorbing member 21 from the open pores. It becomes easy to be absorbed, and it can prevent more reliably that the water droplet by condensation falls from the duct 10. The slab foamed product is a block-like product in which a polyurethane raw material is discharged onto a belt conveyor and foamed under atmospheric pressure, and is known as a soft polyurethane foam.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view and a partially enlarged view of a vehicle air conditioning duct according to an embodiment of the present invention. It is an AA schematic sectional drawing of FIG. It is a perspective view of the flexible sheet-like water absorption member in which the duct main body and the slit were formed. It is a perspective view which shows the net-like water absorbing member which expanded the sheet-like water absorbing member which has flexibility in a slit part.

DESCRIPTION OF SYMBOLS 10 Vehicle air-conditioning duct 11 Duct body 21 Reticulated water absorbing member 21A Flexible sheet-shaped water absorbing member 22 Mesh 22A Slit

Claims (1)

On the outer surface of the duct main body, a water absorbing member made of a foam having flexible sheet-like continuous air holes having a plurality of slits formed at predetermined intervals is pulled on the outer surface of the main body while pulling in the direction in which the slit expands. A method for manufacturing an air conditioning duct for a vehicle, characterized in that the slit is widened and attached in a net shape.

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