JP2003326943A - Vehicular air conditioning air duct structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce ventilation noise of an air duct for arranging a plurality of air blowoff ports in a duct side wall by extending in a straight line shape. <P>SOLUTION: An air conditioning air duct 1 extends in a straight line shape along the roof side of a cabin. This vehicular air conditioning air duct structure is formed by arranging a plurality of air blowoff ports 2A and 2B at a prescribed interval in the lengthwise direction of the duct on the duct side wall 10 facing to the cabin. The air conditioning air duct 1 forms an air main passage X for ventilating an air flow of air conditioning air to the duct downstream side and an air separating passage Y for separating air to the intermediate air blowoff port 2A side by partitioning the inside of the duct in parallel to the air flow of the air conditioning air in a position corresponding to an intermediate air blowoff port 2A arranged in a lengthwise directional intermediate position of the duct. A downstream side tail end part 30 is provided with a partition wall 3 for closing the air separating passage Y in a position on the duct downstream side of the intermediate air blowoff port 2A. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioning air duct, and more particularly to a vehicle air conditioning air duct structure in which a plurality of air outlets are provided on the side surface of a linearly extending air duct.

[0002]

2. Description of the Related Art Conventionally, in a box type wagon or the like having a wide passenger compartment, an air conditioner is provided not only in the front of the passenger compartment but also in the rear of the passenger compartment. Generally, in this type of vehicle, as shown in FIG. 3, an air conditioner 6 for the rear part of the passenger compartment is embedded inside one side wall of the rear part of the passenger compartment, and from the air conditioner 6 to the rear pillars of the passenger compartment and the left and right of the passenger compartment. Air duct 1 along the roof side
A is extended. The air duct 1A is provided with a plurality of air outlets 2A and 2B at front and rear intermediate positions and front ends of a duct side wall facing the passenger compartment of the straight portion, with the front ends of the straight portions along the left and right roof sides being closed. Exit 2A, 2B
Air-conditioning air is blown from the car to the passenger compartment.

By the way, in a structure in which a plurality of air outlets are arranged side by side on the side wall of the air duct, the amount of air blown out from each air outlet varies. In order to solve this problem, if a structure is provided in which a branch duct that branches off from the duct main body is provided and an air outlet is provided in the branch duct, the branch duct projects toward the vehicle interior and the upper space of the vehicle interior is increased. Not only is it constrained, it also looks bad.

Therefore, the structures shown in FIGS. 4A, 4B and 5 are generally adopted. FIG. 4A is a side view of a straight line portion along a roof side of a conventional typical air duct 1A as seen from the vehicle interior side, and FIG. 4B is a horizontal sectional view. FIG. 5 is a corresponding view of another conventional duct structure shown in FIG. 4 (B). In the figure, the arrow indicates the air flow of the conditioned air. Figure 4
In the structure shown in (A) and (B), a plurality of air outlets 2A and 2B are provided in one flat plate-shaped duct side wall 10 facing the passenger compartment in a straight portion along the roof side of the air duct 1A, A guide plate 4 is provided at a position on the downstream side of the air outlet 2A in the inside of the duct, which projects from the duct side wall 10 into the duct at a substantially right angle to an intermediate position in the duct. This allows
A part of the wind flow hits the guide plate 4, and the abutting air flows so as to partly flow toward the air outlet 2B and partly to be blown out from the air outlet 2A. Further, in the conventional structure of FIG. 5, instead of the guide plate 4, a throttle 5 that bulges the duct side wall 10 into the duct at a right angle is provided, and the airflow toward the air outlet 2B and the airflow emitted from the air outlet 2A are provided. I'm trying to split it.

[0005]

However, in the above-described conventional structure, when a part of the wind flow collides with the guide plate 4 or the diaphragm 5 and splits, a turbulent flow such as a vortex is generated, and ventilation noise is generated, which causes noise to the ear. May be. Therefore, the present invention is
An air duct for vehicle air conditioning that can divert a predetermined amount of airflow to an air outlet in the middle of an air duct that extends linearly and has a plurality of air outlets on one side wall of the duct, and that reduces ventilation noise The task was to provide a structure.

[0006]

SUMMARY OF THE INVENTION The present invention is an air-conditioning air duct that extends linearly along the roof side of a passenger compartment, and has a predetermined interval in the longitudinal direction of the duct on the side wall of the duct facing the passenger compartment. In a vehicle air conditioning air duct structure having a plurality of air outlets, the air conditioning air duct,
An air main flow path that divides the inside of the duct parallel to the air flow of the air conditioning air at a position corresponding to the intermediate air outlet provided at an intermediate position in the longitudinal direction of the duct to allow the air flow of the air conditioning air to flow to the downstream side of the duct and the above intermediate air. An air branching channel that diverts the air to the outlet side is formed, and a partition wall is provided so that the downstream end portion closes the air branching channel at a position downstream of the duct from the intermediate air outlet ( Claim 1). The airflow in the duct is divided into the main air flow path side and the intermediate air outlet side without the flow direction changing suddenly at the edge of the partition wall, and turbulence and ventilation noise resulting therefrom are hardly generated.

In the air conditioning air duct, the side wall is formed in a flat plate shape extending in the vehicle front-rear direction, and the bottom wall on the downstream side of the intermediate air outlet is made higher than the upstream side to cut off the flow passage on the downstream side. The area is narrower than that on the upstream side, and the partition wall that closes the diversion channel is connected to the stepped portion of the bottom wall (claim 2). Since the flow passage cross-sectional area of the duct on the downstream side of the intermediate air outlet is made smaller, the wind velocity of the air flow toward the downstream air outlet does not decrease, and the air volume of the downstream air outlet can be maintained.

The air inlet of the air distribution channel is provided at the upstream end of the intermediate air outlet or at a position upstream of the duct with respect to the upstream end (claim 3). It is possible to ventilate the divided airflow to the intermediate air outlet to the intermediate air outlet in a stable state.

The air-conditioning air duct is composed of a rectangular duct blow-molded of synthetic resin, and the partition wall is formed by joining the tips of the projecting portions projecting from the side walls of the ducts facing each other. Item 4). The productivity is good and the production cost can be low.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is applied to an air conditioning air duct extending along a roof side in a vehicle compartment will be described. As shown in FIG. 3, in the side wall at the rear of the passenger compartment,
An air conditioner 6 is installed in a space between an outer plate forming an outer surface of a vehicle body and a quarter trim forming a side wall of a vehicle compartment. An air conditioning air duct 1 extends from the upper surface of the rear part of the air conditioner 6.

The air duct 1 is a cylindrical body made of synthetic resin formed by blow molding, stands up along one rear pillar of the vehicle body, branches off from its upper end into two branches, and one branch is a roof side on one side of the passenger compartment. A linear portion extending along the other side is formed, and the other is linearly extended along the other roof side from the branch portion through a portion along the roof rear edge of the vehicle compartment. The end of each straight line is closed.
The right and left straight portions, the portion along the rear edge of the roof, and the upright portion along the rear pillar are formed by different members, and the parts are connected to form a series of air ducts 1. The air duct 1 is covered with a ceiling trim and a pillar garnish, and air-conditioning air is blown toward the passenger compartment through the ceiling trim at the intermediate position on the upstream side of the duct and the front end on the downstream side of the duct in each of the straight portions. Air outlets 2A, 2
B is formed.

The details of the duct structure of the straight portion extending along the one roof side of the air duct 1 will be described below with reference to FIGS. 1 and 2. Since the duct structure of the other straight line portion is the same as that of the one straight line portion, a description thereof will be omitted. As shown in FIG. 1 (A), the straight portion of the air duct 1 (hereinafter, simply referred to as the air duct 1) has a rectangular tubular shape in which a side wall 10 facing the vehicle interior and a side wall 11 facing the side wall are both flat plates. The air conditioning air is ventilated from the rear upstream side (right side in the figure) to the front side (arrow in the figure).

The air duct 1 is formed such that the upper and lower widths of the duct upstream portion 1a are relatively wider than those of the duct downstream portion 1b. Between the upstream portion 1a and the downstream portion 1b, the bottom wall is slanted forward and upward. The rising step portion 12 is provided so that the bottom wall of the downstream portion 1b is higher than the bottom wall of the upstream portion 1a, and the vertical width of the downstream portion 1b is narrowed. Further, the vertical width of the downstream terminal portion 1c is slightly enlarged below the downstream portion 1b.

The air outlet 2A is formed in the lower half of the side wall 10 at a position near the step 12 in the upstream portion 1a. The air outlet 2B is formed at a position below the side wall 10 in the downstream terminal portion 1c.
B is a rectangular rectangular hole along the longitudinal direction of the duct, and has substantially the same opening area, and the air outlets 2A and 2B are fitted with air outlet grills 20 that penetrate the ceiling trim.

As shown in FIGS. 1 (A) and 1 (B), in the upstream portion 1a, from the bent portion 13 between the step portion 12 of the bottom wall and the bottom wall of the downstream portion 1b, obliquely upward and rearward. A partition wall 3 is formed which extends in an inclined shape and is bent from the inclined portion 30 and extends horizontally along the upper edge of the air outlet 2A. The partition wall 3 has almost the same thickness as the side walls 10 and 11, connects the side walls 10 and 11, and the horizontal portion 31 partitions the duct into upper and lower parts in parallel with the airflow of the air-conditioning air, and the air is placed above the duct. An air main flow path X that ventilates the conditioned air toward the air outlet 2B and an air branch flow path Y that diverts the conditioned air to the air outlet 2A side are formed below. A rear end of the horizontal portion 31 of the partition wall 3 extends to a position upstream of the air outlet 2A, and an inlet of the air distribution passage Y is formed at a position upstream of the air outlet 2A. In addition, the partition wall 3 has an inclined portion 3
The lower end of 0 connects to the bent portion 13 of the bottom wall and closes the air distribution channel Y at a position downstream of the air outlet 2A.

The partition wall 3 has a narrow protruding portion 101 protruding into the duct from a side wall 10 on the passenger compartment side, and the protruding portion 10
As in the case of No. 1, a projecting portion 111 that projects into the duct from the other side wall 11 is formed, and the tip portions of both projecting portions 101 and 111 are joined together. In order to form the partition wall 3 in this way, as shown in FIGS. 2A and 2B, the left and right molds 7a and 7b forming the cavity are respectively thin plates 71a that can be extruded into the cavity. , 71
b, a synthetic resin material is blow-molded in the cavity to form a rectangular tubular duct member 1 '(FIG. 2 (A)), the plates 71a, 71b are immediately pushed into the cavity, and the left and right side walls 10, Protrusions 101 and 111 are formed on 11 and the tips of both protrusions 101 and 111 are abutted and connected (FIG. 2 (B)). Then, the duct member 1'is cooled, the plates 71a, 71b are pulled back, and the molds 7a, 7b are opened. By integrally molding the partition wall 3 during blow molding of the duct in this way, the duct productivity is good and the production cost can be reduced. The openings for the air outlets 2A and 2B are cut out after being taken out from the molds 7a and 7b.

According to this embodiment, the air flow of the conditioned air in the air duct 1 is divided into the air main flow X and the air distribution flow passage Y which are vertically divided by the partition wall 3 in the upstream portion 1a. At this time, the wind flow is smoothly divided at the rear end of the thin partition wall 3 formed in parallel with the flow direction without a sudden change and with extremely small resistance, and no ventilation noise is generated which makes the occupants feel the ears. . In addition, since the flow passage cross-sectional area of the duct on the downstream side of the air outlet 2A is made smaller in accordance with the decrease in the air volume, the flow velocity hardly decreases regardless of the decrease in the air volume, and is blown out from the air outlet 2B. The amount of air flow can be substantially the same as that of the air outlet 2A.

Further, since the end of the horizontal portion 31 of the partition wall 3 is provided at the downstream position of the air outlet 2A and the air branch channel Y is set to be long, the air branch channel Y is branched to the air branch channel Y side. It is possible to ventilate the generated airflow to the air outlet 2A in a stable state and blow it out more smoothly from the air outlet 2A.

The air duct 1 may have a uniform flow passage cross-sectional area over its entire length, but it is advantageous to make the downstream portion 1b of the air duct 1 small in order to maintain a sufficient blowing velocity at the air outlet 2B. is there. Further, by making the downstream portion 1b thin, it is possible to secure a mounting space for an assist grip or the like mounted on the roof side of the vehicle compartment. Further, the upstream portion 1a of the air duct 1 has a structure in which the inside of the duct is partitioned vertically by the partition wall 3, but the structure is not limited to this, and the inside of the duct may be partitioned left and right.

[0020]

According to the present invention, a partition wall parallel to the air flow is provided inside an air duct which extends linearly and has a plurality of air outlets on one side wall of the duct, and the inside of the duct is directed downstream. Since the main air flow path toward the middle air outlet and the air branch flow path toward the middle air outlet are partitioned, it is possible to smoothly divert the air flow toward the middle air outlet without causing turbulence, and the generation of ventilation noise that is harsh to the occupants Can be prevented.

[Brief description of drawings]

FIG. 1 shows an air duct for air conditioning of the present invention.
FIG. 1A is a side view of the straight portion along the roof side of the air duct as seen from the passenger compartment side, and FIG. 1B is a sectional view taken along line IB-IB in FIG. 1A.

2 (A) and 2 (B) are schematic explanatory views showing a molding step of providing a partition wall in a duct.

FIG. 3 is a schematic perspective view showing an air duct installed in a rear portion of a vehicle compartment of a wagon vehicle or the like.

FIG. 4 (A) is a side view of a straight portion along a roof side of a conventional air duct as seen from a vehicle compartment side, and FIG. 4 (B) is a horizontal sectional view of the air duct.

FIG. 5 is a horizontal sectional view of another conventional air duct.

[Explanation of symbols]

1 Air conditioning duct 1a upstream 1b downstream 10 One side wall 101 protrusion 11 Other side wall 111 protrusion 13 border 2A Intermediate air outlet 2B Downstream air outlet 3 partition walls 30 Downstream end (slope)

Continued front page    (72) Inventor Yoshinori Yanagimachi             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO (72) Inventor Yoshihiro Furumoto             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO (72) Inventor Yasuaki Sasaki             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO (72) Inventor Hiroshi Fujita             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO F-term (reference) 3L011 BL00 BS02                 3L080 AA02 AB07 AC01 AD01

Claims (4)

[Claims] 1. An air conditioning air duct extending linearly along a roof side of a vehicle compartment, wherein a plurality of air outlets are provided on a side wall of the duct facing the vehicle compartment at predetermined intervals in a longitudinal direction of the duct. In the air-conditioning air duct structure for a vehicle provided, the air-conditioning air duct is partitioned into a position parallel to the air flow of the air-conditioning air at a position corresponding to an intermediate air outlet provided at an intermediate position in the longitudinal direction of the duct. The main air flow passage for ventilating the air flow of the duct to the downstream side of the duct and the air branch flow passage for diverting the air flow to the intermediate air outlet side, and the terminal portion on the downstream side makes the air branch passage more duct than the intermediate air outlet. An air duct structure for air conditioning of a vehicle, characterized in that a partition wall that is closed at a position on the downstream side is provided. 2. The air-conditioning air duct has the side wall formed in a flat plate shape extending in the vehicle front-rear direction, and the bottom wall on the downstream side of the intermediate air outlet is made higher than the upstream side so that the flow on the downstream side is increased. 2. The air duct structure for a vehicle air conditioner according to claim 1, wherein the road cross-sectional area is narrower than that on the upstream side, and the partition wall that closes the air distribution channel is connected to a stepped portion of the bottom wall. 3. The air duct structure for a vehicle air conditioner according to claim 1, wherein the inlet of the air distribution channel is provided at an upstream end of the intermediate air outlet or at a position upstream of the duct from the upstream end. 4. The air-conditioning air duct is composed of a rectangular duct formed by blow molding a synthetic resin material, and the partition wall is
The air duct structure for air conditioning of a vehicle according to claim 1, wherein the air duct structure for a vehicle is formed by joining the tips of projecting portions projecting from the side walls of the ducts facing each other.