JP2006205831A - Vehicular air duct - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a condensation proof function for a vehicular air duct disposed inside interior members, so as to discharge temperature-conditioned air sent out from an air conditioning system of a vehicle such as a car to the inside of the vehicle, and to provide high productivity by eliminating need for expanded-sheet covering, thus attaining significant reduction in manufacturing cost. <P>SOLUTION: This vehicular air duct is integrally formed into a prescribed hollow body with an outer sheath laminated with a rigid resin layer 2 having high airtightness and stiffness and a foamed resin layer 3 having high thermal insulation. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle air duct that is disposed inside an interior member for indoor air conditioning in a vehicle such as an automobile.

  As a member for indoor air conditioning of vehicles such as automobiles, the inside of an interior member such as an instrument panel is used to guide the conditioned air sent from the air conditioner to the discharge port and discharge it into the vehicle interior. An air duct is disposed at the bottom. In general, this air duct is formed by blow-molding a resin material such as polyethylene into a predetermined hollow shape having an irregular cross section corresponding to the arrangement path.

  In such an air duct for a vehicle, since the outer skin is formed to be relatively thin, there is a problem that condensation occurs on the duct surface due to a temperature difference between the inside of the duct through which the temperature-controlled air flows and the outside of the duct. In order to prevent the occurrence of this dew condensation, measures are taken to wrap and paste a foam sheet such as urethane foam around the outer peripheral surface of the air duct and cover the air duct with a foam sheet having a predetermined heat insulating property. ing.

  On the other hand, such an air duct for a vehicle is arranged through various vehicle equipments housed inside the interior member, so that the outer shape thereof becomes a complicated three-dimensional shape with a continuous bent surface, and is placed at the installation position. Since the shapes of the foam sheets are different from each other, the above-described foam sheet covering operation is difficult to automate and is performed manually, which is extremely complicated. Therefore, workability and productivity are remarkably inferior, and the production cost of an air duct having a dew condensation prevention function is high.

  The present invention is intended to solve these problems, and has a dew condensation prevention function, improves the productivity by eliminating the need to cover the foam sheet, and can greatly reduce the production cost. A vehicle air duct is proposed.

  In order to achieve the above object, the present invention provides a vehicle air duct disposed inside an interior member for discharging temperature-controlled air sent from an air conditioner of a vehicle such as an automobile into a vehicle interior. It is characterized in that it is integrally molded into a predetermined hollow shape body with an outer skin in which a hard resin layer 2 having airtightness and rigidity and a foamed resin layer 3 having heat insulation properties are laminated.

  Further, the vehicle air duct of the present invention forms the outer skin with the hard resin layer 2 on the inner peripheral surface and the foamed resin layer 3 on the outer peripheral surface, or conversely, the hard resin layer 2 on the outer peripheral surface. An outer skin is formed with the foamed resin layer 3 as an inner peripheral surface.

  The air duct for a vehicle according to the present invention is an outer shell obtained by laminating a hard resin layer 2 and a foamed resin layer 3 and is integrally formed into a predetermined hollow body, and the foamed resin layer 3 has a predetermined heat insulating property. Therefore, it is possible to prevent the occurrence of condensation due to the temperature difference between the inside and outside of the duct through which the temperature-controlled air sent from the air conditioner flows. Therefore, the conventional foam sheet covering operation is not required at all, the productivity is remarkably improved, and the production cost can be greatly reduced.

  In addition, by forming the outer skin with the hard resin layer 2 as the outer peripheral surface and the foamed resin layer 3 as the inner peripheral surface, the foamed resin layer 3 functions as a sound absorbing material, which is due to the operating noise of the blower of the air conditioner and the disturbance of the airflow Noise can be prevented from leaking into the vehicle compartment, and noise can be reduced.

Hereinafter, the best embodiment of the present invention will be specifically described with reference to the drawings.
1 and 2 show a first embodiment of a vehicle air duct according to the present invention. FIG. 1 shows the entire air duct 1 and FIG. 2 shows an end face obtained by cutting the air duct 1. As shown in FIG. 1, the air duct 1 disposed inside the interior member is formed in a predetermined hollow shape body having a modified cross section corresponding to the disposition path.

  This air duct 1 is integrally molded by a multilayer blow molding means with an outer skin in which a hard resin layer 2 having airtightness and rigidity and a foamed resin layer 3 having heat insulation properties are laminated. For example, the hard resin layer 2 Is formed of a resin material such as polyurethane or polystyrene.

  As shown in FIG. 2, the air duct 1 has a hard resin layer 2 as an inner peripheral surface and a foamed resin layer 3 as an outer peripheral surface, and a shell is formed on the outer peripheral surface of the hard resin layer 2. It is molded as a single piece. Therefore, since the foamed resin layer 3 has a predetermined heat insulating property, it is possible to prevent the occurrence of condensation, and the conventional foam sheet covering operation is not required at all.

  FIG. 3 shows an end face of the air duct for a vehicle according to another embodiment of the present invention, in which the air duct is cut. As shown in the figure, this air duct has an outer skin formed with a hard resin layer 2 as an outer peripheral surface and a foamed resin layer 3 as an inner peripheral surface. In this embodiment, since the foamed resin layer 3 has a predetermined heat insulating property as in the previous example, the occurrence of condensation can be prevented, and the foamed resin layer 3 functions as a sound absorbing material to reduce noise. Can be achieved.

1 is a perspective view of an entire air duct according to a first embodiment of the present invention. The expanded end view cut | disconnected by the AA line in FIG. The end view which cut | disconnected the air duct in the middle in another Example of this invention.

Explanation of symbols

2 Hard resin layer 3 Foamed resin layer

Claims (3)

In a vehicle air duct disposed inside an interior member in order to discharge temperature-controlled air sent from an air conditioner of a vehicle such as an automobile into the vehicle compartment,
An air duct for a vehicle, characterized by being integrally molded into a predetermined hollow body with an outer skin in which a hard resin layer 2 having airtightness and rigidity and a foamed resin layer 3 having heat insulation properties are laminated.   The air duct for vehicles according to claim 1, wherein the outer skin is formed with the hard resin layer 2 on the inner peripheral surface and the foamed resin layer 3 on the outer peripheral surface. The vehicle air duct according to claim 1, wherein an outer skin is formed with the hard resin layer 2 as an outer peripheral surface and the foamed resin layer 3 as an inner peripheral surface.

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