JP3155325U - Air duct for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To significantly improve sound insulation in 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 the vehicle interior. The noise of air conditioning operation is reduced by preventing leakage of noise. SOLUTION: An outer skin in which non-foamed synthetic resin layers 3 and 4 having airtightness and rigidity are laminated on an inner peripheral surface and an outer peripheral surface of a foamed resin layer 2 having heat insulating properties and sound absorbing properties, by a multilayer blow molding means. An air duct for a vehicle, which is integrally molded into a predetermined hollow body. [Selection] Figure 2

Description

  The present invention relates to a vehicle air duct 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 including automobiles, in order to guide the temperature-controlled air sent from the air conditioner to the discharge port and discharge it into the vehicle interior, it is inside the interior member such as an instrument panel. An air duct is disposed. Generally, this air duct is formed into a predetermined hollow shape body having a deformed cross section corresponding to an arrangement path by blow molding a resin material such as polyethylene.

  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. However, since the air duct for vehicles is arranged between various vehicle equipment housed inside the interior member, its outer shape becomes a complex three-dimensional shape with a continuous bent surface, depending on the arrangement position. Since the shapes are different from each other, the above-described foam sheet coating 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.

  On the other hand, as shown in Japanese Patent Application No. 2005-18622, a predetermined hollow shape is formed by an outer skin in which an unfoamed synthetic resin layer having airtightness and rigidity and a foamed resin layer having heat insulation properties are laminated. A vehicle air duct that is integrally formed with the body has also been proposed. This is a multi-layer blow molding means, which is an outer shell obtained by laminating an unfoamed synthetic resin layer and a foamed resin layer, and integrally forming a predetermined hollow shape body, thereby eliminating the need for a conventional foam sheet covering operation. The purpose is to reduce the manufacturing cost.

Japanese Patent Application No. 2005-18622

  In this way, the air duct for vehicles, which is integrally formed with the outer skin obtained by laminating the unfoamed synthetic resin layer and the foamed resin layer, has a function of preventing condensation, but leaks noise due to turbulence of the blower operating sound and airflow. Prevention is not perfect, and there is a problem with sound insulation.

  The purpose of this device is to solve these problems. By significantly improving the sound insulation, the leakage of noise into the vehicle interior is prevented to reduce noise in the air conditioning operation and to improve the performance. 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. An outer shell in which unfoamed synthetic resin layers 3 and 4 having airtightness and rigidity are laminated on the inner and outer peripheral surfaces of the foamed resin layer 2 having heat insulation and sound absorption properties, and having a predetermined hollow shape by multilayer blow molding means It is characterized by being integrally formed with the body.

  The air duct for a vehicle of this invention is an outer skin in which unfoamed synthetic resin layers 3 and 4 having airtightness and rigidity are laminated on an inner peripheral surface and an outer peripheral surface of a foamed resin layer 2 having heat insulating properties and sound absorbing properties, The outer shell is formed in a three-layer structure in which a foamed resin layer 2 that is a sound absorbing material is sandwiched between non-foamed synthetic resin layers 3 and 4 that are sound reflecting materials. The As a result, the sound insulation is remarkably improved, and the noise caused by the operating sound of the blower of the air conditioner and the turbulence of the airflow is prevented from leaking into the vehicle interior, and the noise and silence of the air conditioning operation can be realized. .

  Moreover, since the foamed resin layer 2 has a predetermined heat insulating property, it is possible to prevent the occurrence of condensation due to a temperature difference between the inside and outside of the duct through which the temperature-controlled air sent from the air conditioner flows. This eliminates the need to cover the foam sheet at all, which is excellent in productivity and can greatly reduce the production cost.

The perspective view of the whole air duct in the Example of this device. The expanded end view cut | disconnected by the AA line in FIG.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
1 and 2 show an 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 formed by multilayer blow molding means, and has an unfoamed synthetic resin layer 3, 4 having airtightness and rigidity on the inner and outer peripheral surfaces of a foamed resin layer 2 having heat insulation and sound absorption. It is integrally formed with a laminated skin. As shown in FIG. 2, the air duct 1 has a three-layer structure in which the front and back of the foamed resin layer 2 are sandwiched between unfoamed synthetic resin layers 3 and 4, and is excellent in rigidity and foamed with a sound absorbing material. The resin layer 2 has a multi-layer structure with excellent sound insulating properties sandwiched between unfoamed synthetic resin layers 3 and 4 which are sound reflecting materials.

  The vehicle air duct is preferably formed by vacuum blow molding means. The foamed resin layer 2 is molded with a low-pressure blow pressure by the vacuum blow molding means, and the foaming ratio of the foamed resin layer 2 is increased, and the heat insulation and sound absorption can be improved.

2 Foamed resin layer 3 Unfoamed synthetic resin layer 4 Unfoamed synthetic resin layer

Claims (1)

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 outer skin in which non-foamed synthetic resin layers 3 and 4 having airtightness and rigidity are laminated on the inner and outer peripheral surfaces of the foamed resin layer 2 having heat insulation and sound absorption, and having a predetermined hollow shape by multilayer blow molding means A vehicle air duct characterized by being integrally formed with a body.

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