JPH0858353A - Ventilating duct - Google Patents

Abstract

PURPOSE: To provide a ventilating duct eliminating a noise produced from a flap. CONSTITUTION: In a ventilating duct mounted on a vehicle, the duct is constituted by providing a frame unit 1 formed with discharge ports 13 of discharging air in a car room to outside a car, plate-shaped flaps 2 provided in a manner of covering the discharge port 13 in a car outside of this frame unit 1 to open only in a car outside direction by a pressure difference of air between inside/ outside the car room and a cover-shaped back board 3 with an upper surface opening 31 surrounding the discharge ports 13 in a back surface car room side of the frame unit 1, so as to partition inside this back board 3 by a plurality of partitioning plates 32 toward the discharge ports 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation duct that secures a ventilation amount inside a vehicle while the vehicle is running, and prevents foreign matter, exhaust gas and the like from entering the vehicle interior when the vehicle is stopped.

[0002]

2. Description of the Related Art At the rear of an automobile, there is a ventilation duct for replacing air in the vehicle interior during traveling. Since the relatively narrow vehicle interior is easily polluted by people's breathing, cigarette smoke, etc., fresh air is taken in from the front of the vehicle interior, etc. To do. A flap 2 is attached to the frame 1 forming the discharge port 13, and during traveling, the flap 2 changes its opening degree according to the pressure difference between the inside and outside of the vehicle to adjust the air volume (Fig. 5). Further, the flap 2 functions as a valve body of the check valve, covers the discharge port 13 when the vehicle is stopped, etc., and plays a role of preventing foreign matter (dust, dust, etc.) from entering the vehicle interior from the outside. Furthermore, when the vehicle interior pressure becomes lower than the external pressure, such as when a window is opened during traveling, the flap 2 is in close contact with the exhaust port 13 to prevent exhaust gas suction. Such a ventilation duct is attached to the back of a bumper of an automobile or the like. by the way,
A ventilation duct such as a quarter vent is provided with a water drain 3 as shown in FIGS. 5 and 6 in order to prevent water from entering the vehicle interior during vehicle washing, rainy weather, or the like. The water repellent 3 is generally formed integrally with the frame body 1. However, since the back side of the reinforcing rib 19 of the discharge port 13 is an undercut portion, the slide core 7 is usually used to separate the mold. Then, in consideration of increasing the opening area of the water return section, the inside of the water return section 3 had a simple bag shape (FIG. 6).

[0003]

However, when the water baffle 3 is provided, a turbulent flow is generated in the water baffle due to the abrupt change of the wind direction in the water baffle and the influence of its shape and the like. It was decided to do (Fig. 6). Due to such a turbulent flow, the flap 2 vibrates in small increments and comes into contact with the frame surface 1a (FIG. 7) at a low air volume (up to 80 m ³ / h), which causes fluttering and abnormal noise. Such an abnormal noise was heard near the ears of passengers in the vehicle compartment and gave an unpleasant feeling as noise.

The present invention solves the above problems, and an object of the present invention is to provide a ventilation duct that eliminates the noise generated from the flaps.

[0005]

In order to achieve the above object, the ventilation duct of the present invention is a ventilation duct attached to a vehicle, and has an exhaust port for exhausting vehicle interior air to the outside of the vehicle. And a plate-like flap that is provided outside the vehicle on the outside of the frame to cover the discharge port, and opens only in the direction toward the outside of the vehicle due to the pressure difference between the inside and outside of the vehicle, and the rear vehicle of the frame. A cover-like water catcher that surrounds the discharge port on the chamber side and has an upper surface opening is provided, and the inside of the water catcher is partitioned by a plurality of partition plates facing the discharge port.

[0006]

When the inside of the water baffle is divided into a plurality of partitions by the partition plate facing the outlet like the ventilation duct of the present invention, the air entering the water baffle is prevented from being mixed in the width direction by the partition plate. To be done. Then, a unidirectional flux toward the discharge port is formed, and rectification is maintained. As a result, the flap as a whole floats evenly and stably from the discharge port, so that the flap does not vibrate and come into contact with the surface of the frame body, and there is no fluttering noise.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments.
1 to 4 show an embodiment of a ventilation duct according to the present invention. 1 and 2 are overall perspective views of a ventilation duct according to the present invention, FIG. 3 is a partially enlarged view showing a fitting state of a flap and a frame body, and FIG. 4 is a view taken along line XX of FIG. .

Reference numeral 1 designates two inclined walls 11, a horizontal wall 15 which is connected to lower edges of these inclined walls 11, and an inclined wall 11.
3 shows a frame body having an upper end of the vertical wall 12 and a vertical wall 12 continuously provided at an inner end of the horizontal wall 15. A discharge port 13 is formed in each of the inclined walls 11, and the discharge port 13 is divided into four rectangular sections by three reinforcing ribs 17. Most of the inclined wall 11 and the inclined end surface 171 of the reinforcing rib 17 serve as a receiving surface of the flap 2 described later. An inclined plate 18 is formed around the upper edge of the discharge port 13 and is provided with a mounting hole 181 into which the flap 2 is inserted (FIG. 3). Further, the vertical wall 12 is provided with attachment holes 14 to be attached to the vehicle body at four positions at each corner.

The flap 2 is a plug-in type and comprises a square base portion 21, a hanging foot portion 22 at a constricted portion, and a wedge-shaped insertion portion 23. The insertion portion 23 of the flap 2 is inserted into the mounting hole 181.
When the flap 2 is inserted and the flap 2 is attached to the frame body 1, the base portion 21 hangs down by its own weight to cover the discharge port 13 in a normal state. Then, when the vehicle interior pressure becomes higher than the external pressure, the entire flap 2 tilts around the lower edge of the insertion portion 23 as a fulcrum, and the base 21 floats up from the discharge port 13 to allow ventilation from the vehicle interior to the vehicle exterior. There is. The flap 2 functions as a valve body of a check valve that opens only from the vehicle interior side toward the vehicle exterior side. The material of the flap 2 is a flexible ethylene propylene diene copolymer rubber (JIS A hardness is 5
The flap 2 is made by punching a sheet plate having a thickness of 0.5 mm into a predetermined shape by press molding.

Reference numeral 3 indicates a water drain provided in the shape of a cover with an upper surface opening on the rear vehicle compartment side of the frame body 1. The water return 3 surrounds the discharge port 13 located below and communicates with this, while the other end is bent and then extends vertically upward to form an opening 31 for taking in the air inside the vehicle. Three partition plates 32 are erected in the water return 3 and are arranged toward the discharge port 13 so that the partition plates 32 and the reinforcing ribs 17 are connected to each other. In this embodiment, the frame 1 and the water return 3 are made of a polypropylene resin integrally molded product, and conversely, the reinforcing ribs 17 are extended to form the partition plate 32.

As for the water return height, the upper side thereof is located at the lower edge of the inclined plate 18, and the height of the partition plate 32 also matches this (FIG. 1). Therefore, by adopting the mold dividing surface as shown in FIG. 4, the slide core is not required when the frame 1 and the water return 3 are molded. The partition plate 32 divides the water return 3 (width: about 30 mm, depth: about 80 mm) into four elongated shapes in a plan view, and joins the lower end to the bottom of the water return 3. A small chimney-like body is formed by the partition plate 32 to enhance the rectifying action of the air that enters into the water repellent 3 so that the air volume and the air pressure are made uniform and the air in the vehicle compartment is flowed to the exhaust port.

Using the ventilation duct constructed as described above, when the ventilation state at a ventilation volume of 80 m ³ / h was examined, no noise (slap noise) was hit against the inclined wall 11 of the flap 2, and A ventilation efficiency of 34% was obtained.
On the other hand, in the conventional product in which the partition plate 32 was not provided, a fluttering noise was generated, and the ventilation efficiency was as low as 31%. As described above, according to the present embodiment, the discharge port 13 is provided in the water sink.
By providing a plurality of partition plates 32 facing toward, the air flux is not disturbed in the water return 3 and is rectified and flows out to the discharge port 13, so that the noise generated from the flap 2 disappears. Ventilation volume of ventilation duct is 0 to 80 m ³ /
At low air flow rate in the h region, the flap 2 has generally made a fluttering sound up to now, but the provision of the partition plate 32 made it quiet. Further, conventionally, the water repellent 3 part was treated with a slide core or the like at the time of molding, but it is now possible to avoid undercutting, reducing the mold cost and improving the productivity of ventilation ducts. It was

The present invention is not limited to those shown in the above embodiment, but can be variously modified within the scope of the present invention depending on the purpose, application and the like. For example, the size, shape, material, etc. of the frame 1, the flap 2, the water return 3, and the discharge port 13 are not limited to those in this embodiment, but can be variously changed according to the purpose.

[0014]

As described above, the ventilation duct according to the present invention can eliminate the noise generated from the flap,
Further, it has excellent effects such as reduction of molding die cost and enhancement of productivity.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a ventilation duct according to an embodiment as viewed from a vehicle compartment side.

FIG. 2 is an overall perspective view of the ventilation duct according to the embodiment as viewed from the vehicle outside.

FIG. 3 is a partially enlarged perspective view showing a fitting state of a flap and a frame body.

FIG. 4 is a view taken along line XX in FIG.

FIG. 5 is an explanatory sectional view of a conventional ventilation duct.

FIG. 6 is a perspective view of a prior art ventilation duct.

FIG. 7 is a partial perspective view of a prior art ventilation duct.

[Explanation of symbols]

 1 Frame 13 Discharge Port 2 Flap 3 Water Return 31 Opening 32 Partition Plate

Claims (1)

[Claims] 1. A frame body (1) in a ventilation duct attached to a vehicle, the frame body (1) having an exhaust port for exhausting vehicle interior air to the outside of the vehicle, and a cover for the exhaust port outside the frame body. And a plate-shaped flap (2) that is opened only in the direction toward the outside of the vehicle due to a pressure difference between the inside and outside of the vehicle, and a cover-shaped flap that opens at the top of the frame and surrounds the discharge port on the rear vehicle side Water return (3)
And a ventilation duct configured such that the inside of the water return is partitioned by a plurality of partition plates facing the discharge port.